Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9a79a44f33551a…

MALICIOUS

PDF

42.5 KB Created: 2020-06-21 13:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c598af4da424e864654249d7fba69ca SHA-1: e6564efd4ece0c7cc2b1e6af553f78427e0d315e SHA-256: 0c9a79a44f33551a583cfe79c1cac4f0afef4f66fc4b8cecaa658d2ddc6ae23a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to seemingly unrelated domains and are structured in a way that suggests an SEO link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. While no scripts were explicitly extracted, the presence of numerous external links suggests a potential for redirecting users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://classictactics.com/uploads/1/3/0/2/130291696/130291696.html#f1+2011+xbox+360+manual
    • http://faithliferadio.org/uploads/1/3/0/5/130545565/2354236.pdf
    • http://gilanilawfirm.com/uploads/1/3/0/6/130621947/709df6d0.pdf
    • http://thompsongaydenreunion.com/uploads/1/3/0/7/130739336/3442694.pdf
    • http://thebedspert.com/uploads/1/3/0/2/130287960/9441719.pdf
    • http://dorrplumbingandheating.com/uploads/1/3/0/6/130620677/vurazekijowekoxuz.pdf
    • http://ns1.rachelkodner.com/uploads/1/3/0/7/130776326/6066521.pdf
    • http://costawear.store/uploads/1/3/2/7/132712508/6477439.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069c1.bin
c30d1837e42d0c45a60fffc6d541f827928a968be1f04866698647dbdd3d8000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C1 5000 bytes
font_01_sfnt_off00007a9e.bin
b82ec62e1394b71aac85ba1e0703aedd4b86bd5eb55eaf465f9fc8b198ad4c4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9E 10388 bytes

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