Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafca4cdb5f85e3f…

MALICIOUS

PDF

42.8 KB Created: 2020-04-02 21:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d20b71b6bffd8e0532d24c9815173e38 SHA-1: f57bb8977489d4d64f9c1904cc84332ee64df8e3 SHA-256: bafca4cdb5f85e3fde46f1f7b036c17d852e2e802503ffa803e9bc04caef115f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a large number of external links to other PDF files hosted on various domains. This technique is often used for SEO poisoning or to distribute malware. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm.

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://annotalegal.com/uploads/1/3/0/3/130313130/130313130.html#stellaris+utopian+abundance
    • http://ianandmartha.com/uploads/1/3/1/1/131164567/wabesigud_fijazesaraf_xemodulunolo_jesarofumar.pdf
    • http://shopsuper-nova.com/uploads/1/3/0/7/130739269/vunatekuxabodorom.pdf
    • http://acorncreekstudio.com/uploads/1/3/0/5/130589198/d2ff86c8.pdf
    • http://jeanettevanbeek.com/uploads/1/3/0/7/130776148/wedirepo.pdf
    • http://regencytowersinfo.com/uploads/1/3/0/5/130542996/630441.pdf
    • http://a2zinteriors.org/uploads/1/3/0/5/130539325/1270888.pdf
    • http://holyboidesigns.com/uploads/1/3/0/6/130639172/tokeviximekoj_tuxakewod_fapojebigex.pdf
    • http://sweetalfas.com/uploads/1/3/1/0/131070646/dofos.pdf
    • http://empoweredptbirth.com/uploads/1/3/0/5/130588786/tosogofa.pdf
    • http://primogroupcapital.com/uploads/1/3/0/9/130969700/nutofunifom.pdf
    • http://friditas.com/uploads/1/3/0/6/130621120/7306715.pdf
    • http://shortlistproperties.com/uploads/1/3/0/8/130873737/gebenunekegapebilil.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_off00007f8d.bin
fa0748a511b53fef98fbfaa7fe221dc26821924562c2d29bd0a4ede53b38a7b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8D 7936 bytes

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