Any link inside my WP blog redirect to spam url

I can open my blog from google search page, from WP dashboard, and anywhere.
When I click any link to a post from the sidebar for example, it opens the page but open another tab with spam page “full of continuous redirection”.

1-all traffic gone from 4000 to 100
2-GWT still show sitemap and all links, no errors

I changed:
1-WP core files
2-New theme
3-removed all new plugins and users

Rechecked my blog post links, but it’s still.

What’s next,…thanks in advance