Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52f21f98efedb7f…

MALICIOUS

PDF

14.3 KB Created: 2019-05-03 17:12:06 +01:00 Authoring application: mPDF 5.7
MD5: a264efcf50e12218bbdc08d0df13d981 SHA-1: 57ebbb47a040729dbc043ccb778dfbac2aeaf331 SHA-256: f52f21f98efedb7fe6c5be4f0455d75238dea294f57f7464c282d70ddd6ebccd
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment

The PDF contains a large number of embedded links pointing to external PDFs hosted on the domain 'cefasfese.4pu.com'. This behavior is indicative of a link farm or SEO spam technique, often used to distribute malicious content or drive traffic to malicious sites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9798

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/2739731739734736/Serial-Volume-One-Serial-1-by-Jaden-Wilkes.pdf
    • http://cefasfese.4pu.com/1737737735730736/Serial-Volume-Two-Serial-2-by-Jaden-Wilkes.pdf
    • http://cefasfese.4pu.com/5739731738730732/The-Big-Book-of-Serial-Killers-150-Serial-Killer-Files-of-the-World-s-Worst-Murderers-by-Jack-Rosewood.pdf
    • http://cefasfese.4pu.com/5737736736737731/52-Serial-Shorts---Volume-1-by-Harold-Cobert.pdf
    • http://cefasfese.4pu.com/1736732736732730/Dark-Deeds-Serial-killers-stakers-and-domestic-homicides-Volume-1-by-Susan-Fleet.pdf
    • http://cefasfese.4pu.com/1731737736739735734/The-Red-Shoes-by-Jaden-Wilkes.pdf
    • http://cefasfese.4pu.com/1731738736732736/Reverse-Cowgirl-by-Jaden-Wilkes.pdf
    • http://cefasfese.4pu.com/2734731738738736/Like-Falling-Surfacing-1-by-Jaden-Wilkes.pdf
    • http://cefasfese.4pu.com/1731737736738739738/The-Beast-Series-Boxset-by-Jaden-Wilkes.pdf
    • http://cefasfese.4pu.com/1737737731731739/S-is-for-Serial-by-D-K-Greene.pdf
    • http://cefasfese.4pu.com/2736737739738732/The-Serial-by-Cyra-McFadden.pdf
    • http://cefasfese.4pu.com/3739734733739738/Serial-by-Jack-Kilborn.pdf
    • http://cefasfese.4pu.com/3735732732735736/Serial-Justice-by-Tammy-Whaley.pdf
    • http://cefasfese.4pu.com/2733731739736737/Serial-Killers-by-Brian-Innes.pdf
    • http://cefasfese.4pu.com/1731734734736736/Serial-Hottie-by-Kelly-Oram.pdf
    • http://cefasfese.4pu.com/2732733730737733/Serial-Killers-by-William-Murray.pdf
    • http://cefasfese.4pu.com/1736737733737732/Suicide-Serial-by-Matthew-Boyd.pdf
    • http://cefasfese.4pu.com/6734739735732/Serial-Killer-Groupies-by-R-J-Parker.pdf
    • http://cefasfese.4pu.com/5739731738730730/Serial-Summer-by-Angel-Lawson.pdf
    • http://cefasfese.4pu.com/2737739734736734/Serial-Killers-by-Time-Life-Books.pdf

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