Adware/Malware redirects

Have you tried restarting your iPad yet after Clearing History and Website Data ??

Otherwise, it will be necessary to restore to factory settings > Use iTunes on your Mac or PC to restore your iPhone, iPad, or iPod to factory settings - Apple Support

To help avoid malware / adware on your iPad, make sure the iOS software is up to date. Tap Settings > General > Software Update.

iDevice Safari Phishing Adware Pop-ups

1. Kill Safari by double-tapping on the Home button. Locate Safari in the task bar, then slide the Safari mini-page upwards so it vanishes.
2. Tap Settings > Safari > Clear History and Website Data. Next, locate Security section and slide the “Block Pop-Ups” switch to the On position.
3. Press the Home button to return to your Home screen.
4. If this doesn’t help, then reset your device. It won't delete your data. Press and hold down the On/Off button and the Home button until the display turns off and returns with the Apple logo showing.

Alternatively, follow these instructions to reset your device: Restart your iPhone, iPad, or iPod touch - Apple Support.

When you say reset, you mean just unplugging it and then plugging it back in again? Is there a way for me to know if the DNS was hijacked? I'm getting the redirects only on my iPads, not on the MBP.

For the router, unplug it wait a couple of minutes, and then plug it back in. To do a reset, there should be a small opening on the back labeled reset. Push in the hole with a needle and hold it until it cycles.