Malicious PDF — malware analysis report

Static analysis result for SHA-256 424a870792338444…

MALICIOUS

PDF

40.7 KB Created: 2020-04-06 07:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f938724d34198ff60caa73c81c81dc19 SHA-1: ae8ececd657e54208acbd952cb59d87593507a96 SHA-256: 424a87079233844409e6e8a5ec46cf72c301a96b0a6ffadcdb99aa746122578d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits characteristics of a link farm, embedding a large number of external URLs. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this pattern, suggesting the document's primary purpose is to redirect users to a network of other PDF documents hosted on various domains. The ML classifier strongly supports the malicious nature of this file.

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://sembrandofe.com/uploads/1/3/0/4/130478110/130478110.html#cnn+channel+fios+ny
    • http://cescoequipment.org/uploads/1/3/1/4/131411688/4474342.pdf
    • http://gcshading.com/uploads/1/3/0/3/130379252/ddfde40fd4b.pdf
    • http://gmpliquicaff.com/uploads/1/3/0/4/130483041/7729397.pdf
    • http://deckyourdesktop.com/uploads/1/3/0/4/130488251/8374361.pdf
    • http://pacificartwork.com/uploads/1/3/1/3/131384362/5958851.pdf
    • http://bevwilliamson-artist.com/uploads/1/3/0/6/130605422/088b58c4f73b6e.pdf
    • http://battlemountaingroup.com/uploads/1/3/0/5/130590399/vobebotulu.pdf
    • http://integralskinwtc.com/uploads/1/3/0/6/130639746/7945015.pdf
    • http://mrsseamonsclass.com/uploads/1/3/1/4/131411600/6285492.pdf
    • http://luxytimes.com/uploads/1/3/1/4/131406930/4398786.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_off00006d13.bin
5e126f1c8150434071cace90e6927e87f487c87e5f4f31d6207ff8e6a53da675		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D13 8636 bytes
font_01_sfnt_off00008d8e.bin
7882596a78fedf7411e61954b60ad86f4a9cd4423f99e2a017604429f9ae9e4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8E 1644 bytes

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