Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ff6ce9cff371e3…

MALICIOUS

PDF

105.3 KB Created: 2020-03-28 06:18:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f87de8eb72250d5d174818c864d50ceb SHA-1: 435355065e3101f5269e62b5c279b08f8ab4e5b0 SHA-256: 86ff6ce9cff371e3c2783dead653e7d218abb62b8aed5256501af67628faed44
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 User Execution

The PDF contains a large number of external links, many pointing to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, limiting the ability to determine specific payload delivery or execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://cecilyeiferle.com/uploads/1/3/0/5/130543985/130543985.html#best+ad
    • http://74-123-72-217.mgwnet.com/uploads/1/3/0/6/130639471/fenivibevezemow_xitusuw_gonuli.pdf
    • http://scottsdalebusinessdirectory.net/uploads/1/3/0/6/130621036/2386807.pdf
    • http://mka-remix.com/uploads/1/3/0/4/130483288/kizozi.pdf
    • http://purepulse.net/uploads/1/3/1/0/131070652/retawebuxus_kodavoravedotes_pileduduk_kerenono.pdf
    • http://ahatrade.com/uploads/1/3/0/6/130621134/2789f4c.pdf
    • http://mta-sts.mail.lakesideislove.com/uploads/1/3/0/9/130969354/ce2962d.pdf
    • http://michellerajs.com/uploads/1/3/0/8/130874490/bujugelasajal.pdf
    • http://higginshaven.com/uploads/1/3/0/7/130738562/491d669ad.pdf
    • http://medikka.com/uploads/1/3/0/5/130551775/721423.pdf
    • http://tommywright.org/uploads/1/3/0/5/130540928/5918933.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_off000174be.bin
16bdcfad72e9109b867c90f8bc1c5b4915b4d1a4b91dc1d539695951cda1a093		 pdf-font-stream PDF embedded font (sfnt) at offset 0x174BE 9448 bytes

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