Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d8e2f6b5f22639…

MALICIOUS

PDF

36.4 KB Created: 2020-04-28 13:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eb25b75f01221e714fc653b12f75736f SHA-1: 7e3fb7a498d46c8a2ddff5b453078240607cca00 SHA-256: 19d8e2f6b5f22639540ed4d489a1a2125dc0e9f4b4975814cc5935e8089b6eb6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to artificially boost search engine rankings. One of these links, http://sfbaytherapist.com/uploads/1/3/0/5/130551656/130551656.html#barbie+cooking+game++for+android, is directly embedded in the document body, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://sfbaytherapist.com/uploads/1/3/0/5/130551656/130551656.html#barbie+cooking+game++for+android
    • http://find-ur-sparkle-online.com/uploads/1/3/0/2/130272240/masuvukuxuvinugef.pdf
    • http://canyoncitygrill.com/uploads/1/3/0/7/130738884/291881.pdf
    • http://gracefullymadeboutique.com/uploads/1/3/0/8/130814900/xuladofowisaleg.pdf
    • http://helpinghandfamilia.com/uploads/1/3/0/5/130590123/bomebibisoxolub_gugasonal.pdf
    • http://vansstrands.com/uploads/1/3/0/6/130639192/polokoxepifixak-mavawoxer-woravabozofudo.pdf
    • http://3333welborn.com/uploads/1/3/0/6/130620737/vepozadasago.pdf
    • http://grosirsusumedan.net/uploads/1/3/0/9/130969824/7676754.pdf
    • http://gracefullymadeboutique.com/uploads/1/3/0/8/130814900/xuladof
    • 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_off0000679e.bin
35c98b1f39f5ae74bba66ca9f25e20c1dd6159c7aa5cbc30041ddb7e1c8d7c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x679E 7376 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.