Can mkv files hack or inject virus?

Hi there ADITYA BANGER,

It sounds like you may be receiving pop-ups after downloading a file on your iPhone.

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If we've misunderstood your question, please provide additional details about what's going on.

Thanks!

For all practical purposes your phone cannot be infected by a virus or any other malware. There are a few exceptions, but they apply primarily to a few individuals who are well known on the world stage, such as political leaders, activists and journalists in countries with repressive governments, international criminals, terrorists, etc.

If you think you fall into this category see→device-and-data-access-when-personal-safety-is-at-risk.pdf

No you cannot get infected playing an mkv file.