My phone (galaxy core) has these pop up ads every so often in random patterns while I'm using apps and even when I'm not. Looking at all the solutions online, the ads I have don't look similar to the ones they're trying to fix. Im pretty sure it's the apk files I downloaded but I don't want to have to reset the entire phone, unless there is no other option. I tried virus scanners but it doesn't catch whatever is on my phone. I did a cclean and it saw this thing called advertising cache if that helps. Here's a picture of the type of ads that it shows.