Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c802fc7f35443b…

MALICIOUS

PDF

36.8 KB Created: 2020-04-20 05:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dd517d515e946b4b146b2f0677028634 SHA-1: 570ce47afeb2afb231942b15f6045c939f088bc2 SHA-256: 50c802fc7f35443b0a5d9ff2cccb0a91521769e0421d1e11559b3b808b3c81c0
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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains a URL that presents itself as a free PDF annotator, likely a lure to disguise the malicious nature of the document. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://eagleeyepressurewashing.com/uploads/1/3/0/5/130589036/130589036.html#pdf+annotator+free+portable
    • http://ariannatibbsphotography.com/uploads/1/3/1/4/131483465/1180751.pdf
    • http://knvest.com/uploads/1/3/0/5/130550825/9d5fa893af6b9d.pdf
    • http://ashleylanawheat.com/uploads/1/3/0/5/130545753/ravukuzow.pdf
    • http://heatherraenorthway.com/uploads/1/3/1/4/131483603/mosidazonojon-sikilimetanojat.pdf
    • http://sashalingerie.com/uploads/1/3/0/4/130478307/junovidugemirepide.pdf
    • http://sociology180aalmodovarfinal.com/uploads/1/3/1/0/131070571/7931627.pdf
    • http://truvstudios.com/uploads/1/3/0/4/130483978/kilogese_xukidigarides_satisedu.pdf
    • http://rainsweptgame.com/uploads/1/3/1/3/131384589/sejodul-gowalebetesi.pdf
    • http://elizabethbuckner.net/uploads/1/3/0/6/130604032/fedaxi.pdf
    • http://naturalblissnv.com/uploads/1/3/0/2/130271043/5341330.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_off0000682f.bin
7b711d5fbbfaeacb62fae951f440708ccafbb0f22686242b91086264edf5c142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x682F 8028 bytes

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