This happend on our sites since last friday every day!
The redirect is in all posts in wp_posts and also the site_url in wp_options.
replace it in the DB:
UPDATE wp_posts SET post_content = replace(post_content, “<script src=’the url’ type=text/javascript language=javascript></script>”,”)
– Check if a new user exists with name “wordpresssadminn” or any new -> delete it!
– Change your SQL DB Password
– Change your Admin Passwords
– Install Wordfence and activate the firewall
– Update alle possible Plugins, Themes and WP
There are many other posts here with the same problem.