Malicious PDF — malware analysis report

Static analysis result for SHA-256 08816dd49f4bd365…

MALICIOUS

PDF

36.2 KB Created: 2020-05-24 10:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa079501228bf58f1e8e3515f72dc9c8 SHA-1: b6490eaac3d9318caf7345011cf039b6821d7ef6 SHA-256: 08816dd49f4bd365604a23b6b6f76e5f45d68c961d6d6cfecdc7cf9dfe3d7486
96 Risk Score

Malware Insights

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

The PDF contains numerous external links to domains that appear to be part of a link farm, a common tactic for SEO manipulation or hosting malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links, many with numeric slugs, suggesting a coordinated effort to generate traffic or distribute further payloads. No scripts were extracted, but the structure and heuristics point to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://74-123-76-193.mgwnet.com/uploads/1/3/1/4/131437806/131437806.html#fusibles+seat+ibiza+6l
    • http://cynthiasappsandgames.com/uploads/1/3/1/8/131871535/pefufelok.pdf
    • http://bondedroyalty.com/uploads/1/3/0/5/130543141/e7089fe40e1c6.pdf
    • http://ladydigitalnomad.com/uploads/1/3/0/3/130379522/zozuzufowawo_suzamasilom_guzog.pdf
    • http://badbaggage.com/uploads/1/3/0/5/130588560/d10ab78.pdf
    • http://angelofray.com/uploads/1/3/0/8/130874211/69b7c427f.pdf
    • http://wakingdragonink.com/uploads/1/3/0/7/130776483/sazikaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005605.bin
42a42233c3dfc978715b8cdd97be072016eccd6b2ea04274f0ea1ab03ce23028		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5605 15808 bytes

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