Malicious iFrames has been discovered in more than 100 google play store android applications. 132 Android apps on Google Play are infected with tiny hidden IFrames that link to malicious domains in their local HTML pages. The most popular one has more than 10,000 installs alone. Most likely that the app developers development platforms were infected with malware that searches for HTML pages and injects malicious content at the end of the HTML pages it finds. Currently, infected apps will not cause damage to Android users.”]
Source: https://gbhackers.com/100-google-play-store-apps-infected-malicious-iframes/