My site downloaded some file after proxy enable

My site is
After dns proxy enable in Cloudflare my site is redirect to redacted this url and download some file. But if I disable the proxy it open as normal.
This happen only from visitor of windows os.
All are fine if visitor are from mobile or mac or other operating system.

I have tested by turn of the dns proxy it nomaly open everywhere even in windows computer.

Help me to solve this error.

Welcome to the Cloudflare Community. :logodrop:

I am sorry to hear about your misfortune.

If your site is redirecting to a malicious URL in some circumstances then it is possible your Cloudflare account has been compromised. There have been a few cases where malicious Redirect Rules have been added to accounts that trigger a redirect only with Windows user agents.

You should secure your account by resetting your password, configuring 2FA and rotating your API keys & tokens.

You should also review the audit log to see what malicious configuration has been added and revert it.

In previous cases it has been a Redirect Rule such as this that has been added:

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