Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4f633820e823ab…

MALICIOUS

PDF

28.9 KB Created: 2020-05-26 08:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a12e069c3d6a7c9bbd96ce37af7709b4 SHA-1: f328f3474ec51ff870de44b22451b140da805fff SHA-256: 1b4f633820e823abc8fbf8e9a8a250c75f309e59798124780e06314dfc3b0627
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links to various domains, many of which appear to be part of a link farm designed for SEO manipulation. The ML classifier strongly indicates maliciousness. The primary attack pattern involves directing users to a network of potentially malicious PDF documents hosted on these domains, likely as a lure or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 3

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bshppopup.com/uploads/1/3/1/4/131437827/131437827.html#soul+calibur+nude
    • http://arch-craft.com/uploads/1/3/0/4/130483725/f6e57fceaa924.pdf
    • http://northwindswaterfowl.com/uploads/1/3/0/4/130477293/jomobugimefixupip.pdf
    • http://dekrachtvanverbeelding.nl/uploads/1/3/1/4/131437364/ripusebizalumo.pdf
    • http://clarevalleybowentherapy.com/uploads/1/3/1/4/131438299/tuzakovupuw.pdf
    • http://frokengronblommor.se/uploads/1/3/0/5/130590043/c970374100eedc3.pdf
    • http://puppiesandpastries.com/uploads/1/3/0/5/130589218/1635430.pdf
    • http://tumutpreschool.com/uploads/1/3/0/8/130814754/9158750.pdf
    • http://sleevestshirts.org/uploads/1/3/0/7/130776827/jovoganijivujirunuf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048b0.bin
c3f7fcde33d1cd6d536c6d72296aa920bb3ab672b89ac01cd57a0e76b0b41c53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48B0 9480 bytes

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