Is this malware?

Hello, fellow Apple users.

I have currently been receiving suspicious messages informing me that I may have my browser and/or computer infected with a virus. I may not be correct about this, but I have been informed that there are no viruses for Macs. Here are some pictures of the messages, which I cannot 'X-Out' of most (Forcing me to quit my browser):

Please do note that all the numbers are different on these pictures, which makes me suspicious of potential phishing, or at least some type of scam.

I have also been having difficulties with my browser. My searches are always redirected to a search engine named 'Thesmartsearch'. Also, I am commonly redirected to a new tab, which gives me the messages shown above. Here is a picture of my Safari preferences, which clearly shows that my search engine is

Google:

Here is another picture of my redirect to 'Thesmartsearch':

Lastly, I have another problem that more irritates me than anything. Random words like these will be bolded, colored and underlined, which will pop up a message like this upon hovering over the word:

As you can see above, this is an add by Deal Top. In fact, all of the messages are ads by Deal Top. A family relative who runs a Windows device says that they have similar effects, but the messages warning about a virus are also 'Ads by Deal Top'.

Should I trust these messages (Which I haven't used yet), or could it be malware? Could it be a simple fix that doesn't involve malware at all? Malware or not, what action should I take to remove these annoyances that make Safari next to unusable? Any help is appreciated.