Theres something else lurking out there right now waiting to spam the heck out of you. Adware hides in places where legitimate downloads and apps live. Manual removal of adware is possible, but it can be complicated. If you have trouble downloading the adware removal software, restart in safe mode and disable all browser extensions. Or, your problem may not be related to adware at all. You could be connected to a compromised network, which can cause similar symptoms. If you want to cover all your bases, it doesnt hurt to drop off your Precious at a computer.”]
Source: https://blog.malwarebytes.com/101/2015/07/how-to-remove-adware-from-macs/