A dangerous webpage is taking over my Safari browser

This just takes over Safari with this....Then when I try to back out of it it cycles through these pages...

After some research, I have discovered it is called a browser hijacker. However, there seems to be no answer for how to remove it. I just suddenly started happening. I don't download apps unless they are from the Apple App Store. However, I have not downloaded any apps. When this appears the URL address changes to *** Except it's .xyz I put in the underscore so as not to create a link.

When I copy from the URL the following appears.... (I replaced the "tt" with "xx" and created a space after the slashes also to prevent creating a hot link)

I would appreciate anyone who can tell me how to get rid of this thing.

[Edited by Moderator]