Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af31bddeb8a1985…

MALICIOUS

PDF

36.7 KB Created: 2020-03-30 21:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ccc4af88043d2e3d2117e0af7889253a SHA-1: 97f2fbec7a4f39cce9891e350ce5dc4ea787448c SHA-256: 8af31bddeb8a1985d8a6f6cb5933335131885cc1b25b1231947ce3cca22bc2ab
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to PDF files with numeric slugs on various domains. This behavior is indicative of an SEO spam or link farm tactic, designed to drive traffic to potentially malicious or low-quality content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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://bridgestreampublishing.com/uploads/1/3/0/5/130551433/130551433.html#componentes+de+una+identidad+corporativa
    • http://thebaskamteam.com/uploads/1/3/0/5/130590564/5000587.pdf
    • http://myjboutique.com/uploads/1/3/0/5/130588653/5081599.pdf
    • http://thvpnt.com/uploads/1/3/0/5/130588947/tikolisolatovep.pdf
    • http://nplusdesign.se/uploads/1/3/0/7/130775144/1918789.pdf
    • http://bjm062318.com/uploads/1/3/0/8/130814980/8588066.pdf
    • http://bromleysca.com/uploads/1/3/1/0/131070329/zovumobejozofozewa.pdf
    • http://earthstrongbirth.com/uploads/1/3/0/8/130814631/diligajoli.pdf
    • http://brittanygiametta.com/uploads/1/3/0/4/130476237/supugowuzila.pdf
    • http://realbuchanansbarnyard.com/uploads/1/3/0/6/130639960/fevemubiwomu-xixevevadulaj.pdf
    • http://odbny.com/uploads/1/3/0/6/130639975/buxonewido_winezon_zifeve.pdf
    • http://westpalmlawn.com/uploads/1/3/0/5/130551262/banubo.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_off00006654.bin
ea6fff1f381985216964d39892fe5bc2f45f8e2911eeeb1ae5b3c32840de2c2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6654 8264 bytes

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