Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf7ff6b95aec869…

MALICIOUS

PDF

42.6 KB Created: 2020-03-30 15:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3502bff885a1bfbea32f5a49cfc5d3d5 SHA-1: 5ecbcb7c36b6a93bb1328a38bc6084d67919f1ba SHA-256: bbf7ff6b95aec869393bd80a6ff5c9221129abd73c20d8f122f0e56125e35e64
94 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to a network of domains, indicating a link farm or SEO poisoning tactic. The primary heuristic 'PDF_SEO_LINK_FARM' confirms the presence of 30 external PDF links, with 'chanako.com' being a dominant host. The ML classifier also strongly flagged this PDF as malicious. The document body text, though partially garbled, includes a URL that matches one of the extracted links, suggesting a deliberate attempt to direct users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://yinghuangwangshangyule.br3h.com/uploads/1/3/0/5/130542769/130542769.html#cual+es+la+formula+de+la+longitud+dela+circunferencia
    • http://chanako.com/uploads/1/3/0/5/130588336/ea6e836497459f2.pdf
    • http://vtlsecurity.net/uploads/1/3/0/4/130476168/745dde7.pdf
    • http://personaltouchcoaching.net/uploads/1/3/1/0/131071145/mewane-gixikofe.pdf
    • http://fwkbusinessservices.nl/uploads/1/3/1/3/131381787/5186190.pdf
    • http://shoptheessentiallife.com/uploads/1/3/0/7/130740622/5797450.pdf
    • http://visualimpactlandscaping.com/uploads/1/3/0/4/130483645/3dba438a74e.pdf
    • http://praianohomeimprovement.net/uploads/1/3/0/9/130969879/531496.pdf
    • http://athletesunitedoregon.com/uploads/1/3/0/8/130814471/2215074.pdf
    • http://trakdavis.com/uploads/1/3/0/6/130620991/fuzodew-voponibimumuz.pdf
    • http://let-us-slay.com/uploads/1/3/0/3/130379087/5267826.pdf
    • http://sunhillots.com/uploads/1/3/0/8/130815277/7991266.pdf
    • http://missheatherlee.com/uploads/1/3/1/3/131383841/vizesanuxa-nofiwuwozavit-pokuwuzuz.pdf
    • http://shibapuppies.net/uploads/1/3/0/6/130620325/1486467.pdf
    • http://madelinekingkneeland.com/uploads/1/3/0/3/130323818/85489c78103cb.pdf
    • http://casakiol.com/uploads/1/3/0/4/130436239/rilobutulew.pdf
    • http://deiahvambe.com/uploads/1/3/0/7/130738616/17131ed37926c1b.pdf
    • http://embodiedmotherhood.com/uploads/1/3/0/5/130540116/sodejuzozufivobidet.pdf
    • http://adelasalas.com/uploads/1/3/0/9/130969116/givatuporofepe.pdf
    • http://jobeneventrentals.com/uploads/1/3/0/4/130483194/wurovolu.pdf
    • http://casakiol.com/uploads/1/3/0/4/130436239/r
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070ff.bin
c18922668082b0068bc69aaa844f8891a918764c023e7d7a02a459f8ffb21a6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70FF 8604 bytes
font_01_sfnt_off00009095.bin
4c6c16c8f252e976cb4d53a2552e3417bedae8b7671068c74a83355a8b8fb65a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9095 2680 bytes

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