Malicious PDF — malware analysis report

Static analysis result for SHA-256 46405cd365bdc001…

MALICIOUS

PDF

43.4 KB Created: 2020-04-18 07:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 10454610524fc8147f784110667cc239 SHA-1: 66288f03cfa006a94e2a9c1d39d326cc416a4092 SHA-256: 46405cd365bdc00147f6b435824f0738b1e212450675b3bbc15d97040d86343e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 Malicious Link

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution network. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted from this sample, and the document body is heavily obfuscated, making it difficult to determine the exact payload or intent beyond link distribution.

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://saranlpcoach.com/uploads/1/3/0/5/130543878/130543878.html#blackmagic+design+pocket+4k+manual
    • http://insearchofboredom.com/uploads/1/3/1/3/131398138/6020851.pdf
    • http://classebiblica.com/uploads/1/3/1/4/131438011/8a544a5127c.pdf
    • http://whatcomguttercleaning.com/uploads/1/3/1/3/131384025/kukituboduba_xibaluse_vujowozuzus.pdf
    • http://truegift.us/uploads/1/3/0/5/130590700/lomisesupatemux-vibumeran.pdf
    • http://assuredpropertymanagement.org/uploads/1/3/0/7/130738619/nojufuseto-loxuzarad-bakaxakurux-tanirerutiwen.pdf
    • http://aoentlifestyle.com/uploads/1/3/1/3/131381721/tixumugub.pdf
    • http://fabfairyfinds.com/uploads/1/3/0/7/130776182/jixijuregakowux.pdf
    • http://kerilyngrant.com/uploads/1/3/0/5/130550925/7416462.pdf
    • http://studentdetailing.com/uploads/1/3/0/4/130489523/bfdbe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000775b.bin
c838e3d6ab9b7c873b289212f70d31663005544ae7c2d3ab35713824d0154884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775B 8084 bytes
font_01_sfnt_off00009674.bin
41d5c9cb4d60b7530e3cfd93a78efd430fe179aa57a8296e74fb8a971da4b0ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9674 2600 bytes

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