Ads and "chat invitations" on S4

Hey guys, I have an s4 that is UNrooted - all stock.

I get these green plus signs in the notification bar that are random offers or ads.

I also sometimes get a candy crush thing that opens my internet and play store (and I have never even downloaded candy crush).

Finally, I get these small pop up windows with people that "want to chat."

No real big issues or anything, but its just annoying and am wondering where they come from. I have an antivirus program that scans my phone and it has never found a problem. I've opened porn on my phone but never downloaded anything, or if it accidentally downloaded something I deleted it immediately. Dunno if that has anything to do with it haha.

Anything I can do to fix these things?

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