I am seeing a bunch of 404 errors in the Crawl Errors section of Google Webmaster tools with "gibberish" URLs, that look like:
https://example.com/baqmZ9/P12V0aYabJIjnAhH5mYp/4w967mBzt9iuEWqTtRPxtuUZwaKK3WiHB6vhUJ0nGTUthJCFUThfurFOwe4FT3yJ/QjoVjrT5/k6+tQ==/
https://example.com/asKiRlXposNi466jsUy5g0G6nhezKqoUBl5AOIpGs4KxiSNraYmnxTUaQXtadWXRM7AZyECaVVwaNcKKn99RakcYQU3NELl6lv8KuC6Czzg==/
Where example.com is my site's domain name.
There are around 400 of them, and they do not have Linking information like most other crawl errors.
Any ideas as to what maybe causing this?