Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6951bbaa5523a3…

MALICIOUS

PDF

17.3 KB Created: 2019-04-30 08:49:54 +01:00 Authoring application: mPDF 5.7
MD5: 2aab8aa5e7ceca66f82badf27129f54d SHA-1: 92da52b7ad0eaebcfb9664b415311906e5e39867 SHA-256: 4e6951bbaa5523a3c3a5798138227fcf680f111baef34b086d53cf33bfb16561
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links to other PDF files, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier also flagged this PDF as malicious with high confidence. While the specific intent of the links is unclear due to the benign reputation of the initial set, the sheer volume and the heuristic firing suggest a malicious purpose, likely to lure users to malicious sites or download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

Heuristics 2

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://cefasfese.4pu.com/7733738731736738/Dad-Jokes-I-Think-You-Mean-Rad-Jokes-by-Elias-Hill.pdf
    • http://cefasfese.4pu.com/5739732738735731/Knock-Knock-Jokes-for-Kids-301-Hilarious-and-Funny-Knock-Knock-Jokes-by-Lizzy-Burbank.pdf
    • http://cefasfese.4pu.com/5739732738734737/Knock-Knock-Jokes-for-Kids-50-Funny-Knock-Knock-Jokes-for-Kids-Funny-and-Hilarious-Joke-Books-for-Children-by-Johnny-B-Laughing.pdf
    • http://cefasfese.4pu.com/7733738732739731/Jokes-for-All-Religions-by-Delphon-Coker.pdf
    • http://cefasfese.4pu.com/7730733737734736/STAT-10-jokes-by-Yves-Lessard.pdf
    • http://cefasfese.4pu.com/7733738732737739/The-100-Best-Yo-Mama-Jokes-by-Jess-Franken.pdf
    • http://cefasfese.4pu.com/7733738731736736/Laugh-Out-Loud-Jokes-for-Kids-by-Rob-Elliott.pdf
    • http://cefasfese.4pu.com/6732736735733733/Pride-and-Dad-Jokes-Ideal-Man-1-by-Penny-Reid.pdf
    • http://cefasfese.4pu.com/1739735736731732/Jokes-About-Dead-Girls-by-Richard-Denney-.pdf
    • http://cefasfese.4pu.com/7739732731730738/Best-Back-To-School-Jokes-by-Gene-Perret.pdf
    • http://cefasfese.4pu.com/8735730734739733/Jokes-and-Their-Relation-to-the-Unconscious-by-Sigmund-Freud.pdf
    • http://cefasfese.4pu.com/7739732731731732/Business-Humor-Jokes-How-To-Deliver-Them-by-Gene-Perret.pdf
    • http://cefasfese.4pu.com/2739738732736734/Greatest-Jokes-of-the-Century-Book-22-by-Thomas-F-Shubnell.pdf
    • http://cefasfese.4pu.com/3731734737734731/Madcap-Mulligan-Jokes-for-Kids-Volume-I-by-D-K-Nanook.pdf
    • http://cefasfese.4pu.com/7733738732738730/Timeless-Jokes-Ageless-Wisdom-by-Awdhesh-Singh.pdf
    • http://cefasfese.4pu.com/3731738735730733/Jackie-s-Jokes-Sisters-Eight-4-by-Lauren-Baratz-Logsted.pdf
    • http://cefasfese.4pu.com/1739739737732733/The-Facts-of-Life-and-Other-Dirty-Jokes-by-Willie-Nelson.pdf
    • http://cefasfese.4pu.com/4734737738738735/Stop-Me-If-You-ve-Heard-This-A-History-and-Philosophy-of-Jokes-by-Jim-Holt.pdf
    • http://cefasfese.4pu.com/5730734736731738/The-Little-Red-Book-Of-Little-Read-Jokes-about-the-Enlightened-Left-by-Hermann-Observer.pdf
    • http://cefasfese.4pu.com/7733738732730738/The-Naked-Jape-Uncovering-The-Hidden-World-Of-Jokes-by-Jimmy-Carr.pdf
    • http://cefasfese.4pu.com/77337387317

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