We (Moloco, Inc.) published a guide for detecting bad ad networks with Cross Install. As the online ad industry is getting complicated, the ad fraud is prevailing everywhere (REALLY!!!). This article is a good summary of the contemporary ad fraud, and it would be a good starting point if you want to know about it.
If you want to know more about it, our series of Medium articles will be helpful:
– “Bad Ad Networks Part 1: The “Axis of Evil” in Mobile Ad Fraud”
– “Bad Ad Networks Part 2: Easy Checks With Your MMP”
– “Bad Ad Networks Part 3: Fighting at the Speed of Fraud”
– “DoubleCheck for Ad Fraud”
– “Mobile Ad Fraud Taxonomy”