Welcome to the forums. I agree with B. Diddy, uninstall any app by DU and kill with fire any other app that you installed outside the Play Store.
I've seen a few other threads here where these 'Hot apps' and 'Ram clean' apps showed up. In some cases they were downloaded in the background by another app. What happens if you long press the Hot apps icon? Do you get an option to uninstall it or to get more information about it? Take a screenshot with the options you see after a long press and post it here.
Also, see if this guide can help you to identify which app is pushing those ads.
https://forums.androidcentral.com/sh...d.php?t=901497