What is ad fraud?
Ad fraud is the practice of generating fake or worthless ad activity so that someone gets paid for it. It can mean bots loading pages, apps faking installs or low-quality sites pretending to be premium publishers. Either way, the advertiser pays for impressions, clicks or conversions that no real person saw or chose to make.
In measurement, fraud sits inside a wider bucket called invalid traffic (IVT). Not all invalid traffic is fraud, since some of it is harmless crawlers, but all fraud shows up as invalid traffic. That is why the two terms are often used together.
How ad fraud works
Fraudsters exploit the speed and scale of programmatic advertising, where huge volumes of impressions are bought automatically in milliseconds. Common schemes include:
Bot traffic: scripts or infected devices load pages and ads to mimic human visits.
Domain spoofing: a low-quality site passes a well-known publisher's domain in the bid request so buyers pay premium prices for junk.
Ad stacking and pixel stuffing: several ads are layered on top of each other, or squeezed into a 1x1 pixel, so impressions are counted but nothing is visible.
App and device spoofing: fake app or device signals, a growing problem on connected TV where video prices are high.
Click and install fraud: fake or injected clicks that steal credit for conversions that would have happened anyway.
The Media Rating Council splits invalid traffic into two groups. General invalid traffic (GIVT) covers known crawlers and data center traffic that standard lists can filter. Sophisticated invalid traffic (SIVT) covers bots, hijacked devices and spoofing that need deeper analysis to catch.
Why ad fraud matters
Fraud wastes budget, but the bigger cost is bad data. Fake clicks and conversions inflate results, so bidding algorithms push more money toward the very sources that are cheating. Reports look healthy while real sales stay flat.
Practical defenses for buyers:
Buy only from sellers authorized in ads.txt, app-ads.txt and sellers.json files.
Use pre-bid fraud filtering and post-bid verification on every campaign.
Favor direct, transparent routes to inventory through supply path optimization and curated deals.
Watch for warning signs: very high click rates with no conversions, traffic spikes at odd hours or unknown domains with huge volume.
Judge success on business outcomes, not clicks alone.
Ad fraud vs brand safety
Ad fraud is about whether the impression is real. Brand safety is about whether a real impression appears next to content that could hurt your brand. A campaign can be fraud-free and still run on unsuitable pages, or run on safe-looking pages full of bot traffic. You need controls for both, and they are usually set up side by side.
Ad fraud with AdGeeks
AdGeeks runs campaigns in DV360, Amazon DSP and Adform, which all filter known invalid traffic. Our senior traders add inventory controls and authorized seller checks, review placement reports and cut sources that show suspicious patterns. If you want cleaner spend with no monthly minimum, request access.
