Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85ba179760815ee…

MALICIOUS

PDF

33.2 KB Created: 2020-05-25 20:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2f9769a3f7382cfb0c2b4a8c142a3e2 SHA-1: e89f982bc3a342e2b3aff276e714a0620ddf40a2 SHA-256: e85ba179760815ee93ef0a563c92f9e6de744f2938fbfa764bed01877f1f2586
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO spam tactic. The document body, though partially corrupted, contains references to 'Borderlands 2' and 'puzzle', likely a lure to entice users to click on the embedded malicious URLs. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://xx2tbq.brdge.org/uploads/1/3/0/5/130551184/130551184.html#borderlands+2+bloodshot+stronghold+puzzle
    • http://shop.adventureartpeace.com/uploads/1/3/0/6/130639331/ab6e2.pdf
    • http://laesperanzadelsur.com/uploads/1/3/1/8/131871734/kutigasojekukevixo.pdf
    • http://ashevillehomeguru.com/uploads/1/3/1/3/131379021/9764b02b.pdf
    • http://kachiconcept.com/uploads/1/3/1/4/131483138/1422168.pdf
    • http://crgbridgeportcommercecenter.com/uploads/1/3/0/6/130604980/8275731.pdf
    • http://anamorphicsportal.com/uploads/1/3/0/7/130776330/pefifexi.pdf
    • http://jcelectric.net/uploads/1/3/0/2/130291572/fcfb48c7.pdf
    • http://semenyih-landed.com/uploads/1/3/1/1/131164406/dowenifif_lafejezet_wanoxusa_lejenabide.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_off000055ff.bin
67667d2b50be574d4d549ef3efb2336db92d493b5eb4e6230c8377ee48a6a323		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55FF 10420 bytes

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