Pushshift will be adding a full 4chan API in the next several weeks as well as creating daily / monthly dumps for 4chan data for researchers to use.
Since 4chan has a lot of controversial posts, we cannot provide media dumps along with the textual data. If you are doing ...
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... research that necessitates the inclusion of media, please reach out to me for some options. The biggest issue is the legal exposure surrounding the storage / dissemination of media that could possibly contain illegal content, etc.
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4plebs maintains a list of known-bad MD5 hashes you can use to pre-empt collection of CSAM, though it's an imperfect solution since it's only as good as prior experience.