Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9150c3d5e8a77c…

MALICIOUS

PDF

35.8 KB Created: 2020-04-07 14:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: de00a0e486ecbaa8ddbcaeade670a0ca SHA-1: 31488d7b85e2b7bff98e5382e3fa9884e366b65b SHA-256: ef9150c3d5e8a77ca2cf389838019c6ff0a8760fc85a272d3322eaeee6c0145a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains a URL related to 'Netgear n300 wireless router reset', indicating a lure to a potentially malicious site. The heuristic PDF_SEO_LINK_FARM strongly supports this, indicating the document's primary purpose is to drive traffic to a network of external URLs.

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://masonleigh.com/uploads/1/3/0/7/130740022/130740022.html#netgear+n300+wireless+router+wnr2000+reset
    • http://kalungaproject.com/uploads/1/3/1/3/131381288/2d1a5ee36a33b4.pdf
    • http://kutiepiesweets.com/uploads/1/3/0/7/130739695/1447922.pdf
    • http://www.francescdeverntallat.cat/uploads/1/3/0/4/130489066/6750280.pdf
    • http://mynutrition101.com/uploads/1/3/0/4/130435960/8009a.pdf
    • http://dsrsmashrepairs.com/uploads/1/3/0/5/130551486/mimijarugavesud.pdf
    • http://boulderacupuncture.info/uploads/1/3/0/7/130738933/3378716.pdf
    • http://omazicwatches.com/uploads/1/3/0/6/130639259/2775ea024e0.pdf
    • http://happinessprojectgroup.com/uploads/1/3/1/3/131379743/wijorenubivober.pdf
    • http://sisjogolfklubb.com/uploads/1/3/0/2/130289613/3011850.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_off000062c7.bin
9629f9115d4a4343bd895d6756c342f5df0ffca44c65879876a9074a017188a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C7 8156 bytes

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