Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04c2b8ff01cd022…

MALICIOUS

PDF

39.4 KB Created: 2020-03-08 00:52:42 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e00708270e55931c31229a412776f032 SHA-1: 8e173ece1bee90a325947eaae6dc3fb251fc8027 SHA-256: a04c2b8ff01cd02216cecfec342e8f23f752913a87306c6507db194d5a9dc824
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to PDF files hosted on various domains. The document body text and embedded URLs suggest a lure for downloading 'Adobe Acrobat 9', likely a pretext to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm attack pattern.

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://mcmelegantehotelbeaumont.devsite-1.com/uploads/1/3/1/0/131070493/131070493.html#adobe+acrobat+9+download+filehippo
    • http://mbxmarketing.com/uploads/1/3/0/2/130272506/lonaromot.pdf
    • http://animals-pro.com/uploads/1/3/0/6/130605125/bufepuwamam.pdf
    • http://ejunkie.mobi/uploads/1/3/0/6/130604264/weson_litiripevosuf_manakib_fituw.pdf
    • http://botoxalpharetta.com/uploads/1/3/0/5/130539928/6952924.pdf
    • http://www.self-sustaining-society.org/uploads/1/3/0/5/130590474/c74f51243.pdf
    • http://nswminiaturepony.com.au/uploads/1/3/0/5/130539981/lawiwosabo.pdf
    • http://74-123-73-135.mgwnet.com/uploads/1/3/0/6/130639074/luzituzosubut.pdf
    • http://quintechservices.com/uploads/1/3/0/7/130775826/6089283.pdf
    • http://novovivo.org/uploads/1/3/0/6/130605302/8671593.pdf
    • http://mx.vinemapleconstruction.com/uploads/1/3/0/5/130542710/f417a.pdf
    • http://obscience.org/uploads/1/3/0/4/130483810/b3e9004.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_off000072bb.bin
7d1ce53574344785949d1266c696193dea4a0d12ede262af1e7fa5a4c98ea569		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BB 7668 bytes

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