How to remove adware popups from notifications in S8?
It appears that you enabled notifications for the website tx8t.invictioner.club. 

To turn these off, open Chrome > Site settings > Notifications. Tap tx8t.invictioner.club, tap the bell icon, and choose Block (if similar sites under the filter *.invictioner.club have notification access, block them too).

SOURCE: Turn off notification from websites in Chrome on Android - CNET