Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1920c7e817ea6c…

MALICIOUS

PDF

51.6 KB Created: 2020-04-26 22:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ffd822e118704a5cf435c4635fa2a754 SHA-1: 178f1c5d2d26ee0f3a3185ab43ffe2e96a579f7a SHA-256: 6b1920c7e817ea6c45171967e9c37fa3968d0c6203c8a32f518d4efd6fef2cd0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links to external PDF files, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains a reference to 'Daggerfall beginners guide' and the authoring application 'wkhtmltopdf', indicating a potential lure. The presence of external URIs and a high ML classifier score strongly suggest malicious intent, likely to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://thecarwashteam.com/uploads/1/3/0/2/130272898/130272898.html#daggerfall+beginners+guide
    • http://shootthejallday.com/uploads/1/3/1/3/131379536/e2d1a.pdf
    • http://useyournoodledoodle.com/uploads/1/3/0/5/130589415/ef33378f47eca.pdf
    • http://webruralist.com/uploads/1/3/0/6/130639051/9c8c86b0.pdf
    • http://pinebeltsafety.com/uploads/1/3/0/6/130621964/4691729.pdf
    • http://we-have-hope.com/uploads/1/3/1/0/131069887/veluletuwafofixanu.pdf
    • http://cdrhum.com/uploads/1/3/0/7/130738720/39283599971c.pdf
    • http://bradtwilson.com/uploads/1/3/0/2/130274322/effa81.pdf
    • http://tobymorriscellist.com/uploads/1/3/0/8/130874053/xigazew.pdf
    • http://nomoretoys.org/uploads/1/3/0/5/130538988/vefofom_fukakosemotizip.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a8c0.bin
fa6f1cdacf7d90db563c95109fc059179b8fbfe1a9393993bc860a3b33b333c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8C0 8284 bytes

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