Ive never seen this type of popup before. Its not to call a number but for a software
http://security-alert.fgsmjjpn.top/mackeeper/786a995f7b5cb2699f024989aa461017/index.html?user_os_ver=10.13.1&p1=https%3A%2F%2Fjustredirect25.com%2Fredirect%2Fr1%2Fredirect.php%3Fsi%3DVjN8MTI3ODU4NTJ8MTE4ODQ5NXw5NjY1ODh8MTUxMzU1MjE3NHxiZTdiNTAwOS1lY2Q4LTQxMjUtYTI1YS03ZjAzNTM2ZjU5NDh8NzMuODkuMTQ4LjEyNXwxfGYzZjBiNjdmMGFjNmIwNDFjYmY2ODhlN2ZkZDkyNjgw%26pi%3D12785852%26p1%3D1230012727
whois
TECHNICAL CONTACT
Name:Imre Inge
Organization:n/a
Street:P.O. Inge
City:Gotteborg
State:SE
Postal Code:19122
Country:SE
Phone:+46.20793182
Fax:+46.20793182
Email:[email protected]