spam link injection visible only in certain mobile sets

some hacker is injecting spam links to my website. It appears in home page and article pages when opened in a mobile. In desktop version these links are not visible. the spam appears as junk letters there are hundreds of it in one single page, it appears immediately after the header and menu and before the latest blog article begins. when i checked the header of my website found this link. i am not a code expert. whether deleting this from my header will solve the problem. how the hacker was able to inject this piece to my website. please help. google has marked my site as “possibly hacked” i see the junk values when i opn the url in cache mood in google. inspect element in cache mode shows 1500 nodes inserted, where as if i check in regular mode (not in cache) its not visible.
please help

[ Malware code redacted ]