Experts from Qihoo 360s Netlab analyzed crypto mining scripts online by analyzing DNS traffic with its DNSMon system. The most used crypto mining script is Coinhive (68%+10%), followed by JSEcoin (9%) The fact that cryptocurrency mining scripts are most deployed on porn websites is not a surprise because they have a large number of visitors that used to spend a lot of time watching their content. Some websites will use a shell link to obscure the mining site link in the source code. The mining activity of some websites is introduced by the advertisers external chains.”]
Source: https://securityaffairs.co/wordpress/68949/malware/crypto-mining-scripts.html