Google Safe Browsing is made to protect devices by showing a warning to users when they attempt to request some dangerous website or download dangerous files.
It also notifies webmasters when their websites are compromised and helps them diagnose, resolve the problem so that their visitors stay safer.
If the following image shows up when you try to visit your website, it means that your website has been blacklisted by Google Safe Browsing.
Find out why your website is blacklisted:
You can figure out why your website has been blacklisted by visiting Google’s diagnostic page for your domain name at http://www.google.com/safebrowsing/diagnostic?site=[your domain name]
Open the above-given URL after replacing [your domain name] with the domain name of your website.
The page will show you the current status of your domain, the date Google scanned it last, details about its suspicious content, and instructions on what to do next.
Now you have the reason, you can use this information to aid you in determining how to remove the offending content from your website to remove your website from the blacklist.
It’s important to note that the information you see on the diagnostic page might be out of date because Google does not visit every site on the Internet every day.
Requesting a Review
Once you have resolved the issues found by Google on your website, you will need to ask another review by Google. This is done by using Google Webmaster Tools, which you can use here.
Google also has a walk-through containing all the information you need to resolve a compromised site.