Researchers with White Ops have uncovered a scam to deliver millions of out-of-context (OOC) ads through a group of more than 240 Android applications on the official Google Play store. Most were simple retro games like Nintendo NES emulators, and used packer software to bypass protections. The apps would then deliver OOC ads disguised to appear as if they were from reputable sources like Chrome and YouTube, according to the White Ops team. The scam has since been purged from Google Play, but users should delete them off their phones.
Source: https://threatpost.com/rainbowmix-apps-google-play-ad-fraud/159982/