Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc09d52c1090d341…

MALICIOUS

PDF

36.8 KB Created: 2020-04-07 21:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ee1cd8f359294b767fed24f976248dce SHA-1: d8bb9176079fa1c3269aa8e51bced9a31ef460ec SHA-256: dc09d52c1090d34171cc458d9d1c2bc57dbe348eb55ec89f342ef401de939435
94 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, a technique often used for SEO link farms or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. The embedded URLs point to a network of similarly structured PDF files, suggesting a coordinated effort to distribute content or redirect traffic. No scripts were extracted, limiting the analysis of direct payload execution.

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://adventureinstincts.com/uploads/1/3/1/4/131406852/131406852.html#google+canci%C3%B3n+de+caja+de+medios+de
    • http://alaskafoodie.info/uploads/1/3/0/7/130740187/riwosiva.pdf
    • http://seniors-shop.com/uploads/1/3/0/3/130379292/vixukomukalofa-ditegut-bojupod-lisujer.pdf
    • http://powdercoatprosnd.com/uploads/1/3/1/1/131163793/a3ba6eb4b9fad3.pdf
    • http://provenwatersolutions.com/uploads/1/3/0/7/130739777/modarubusew-navufawexe-doruneku-noxuxetofe.pdf
    • http://bardejugos.com/uploads/1/3/0/6/130605255/jabemesip-ralizofabo.pdf
    • http://justforfundesigns.net/uploads/1/3/1/0/131069744/3442817.pdf
    • http://glengourdie.net/uploads/1/3/0/6/130604692/1778239.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_off00006395.bin
c6b1bc640f699aff59d935774a3604eab3af1d57b4a06f2beb6065d85797a115		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6395 9128 bytes

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