Malicious PDF — malware analysis report

Static analysis result for SHA-256 0095b8ed57ef9f3f…

MALICIOUS

PDF

35.1 KB Created: 2020-04-14 15:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4c266bac23c59b077570ac899e78ad10 SHA-1: 4bf771a9c01e402a4b223857b77c069f9a824e2a SHA-256: 0095b8ed57ef9f3fdca418c39655a8f03534ebb82a7d6fae6ffd850b5147d997
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The ML classifier also strongly indicated maliciousness. The presence of multiple numeric-slugged PDF links points towards a coordinated effort to distribute content or traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://missybs.com/uploads/1/3/0/7/130775828/130775828.html#pdf+to+base64+c+online
    • http://orchestraeroica.com/uploads/1/3/1/4/131452858/00cb296a.pdf
    • http://maddiecone.com/uploads/1/3/1/1/131164507/1993962.pdf
    • http://arjaymurray.com/uploads/1/3/0/6/130621206/muxasozajegazaga.pdf
    • http://lrfjewelersshop.com/uploads/1/3/1/3/131380436/9207712.pdf
    • http://aandtfs.com/uploads/1/3/0/7/130775071/9530329.pdf
    • http://btatraining.net/uploads/1/3/1/6/131637942/d56b9f50d4.pdf
    • http://theluxycloset.online/uploads/1/3/0/9/130968917/618040f6f53181d.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_off0000617c.bin
58267cf9efed3d1bb0190a8719ac7dd605c9b49f4a1a0bd88795a471b2dca85f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x617C 8144 bytes

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