Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15101aa4ff6cb83…

MALICIOUS

PDF

55.1 KB Created: 2020-03-14 16:08:44 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d3536df41f33c306cd8a8bc47a96e8b0 SHA-1: ebcaf8174f1ffa4c493cf01dbbcdff289aa9f74b SHA-256: d15101aa4ff6cb8348e0d5d9537dd55b9d7dffe375d29aa32fe3a0d83ca474d2
94 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, many of which point to SEO-optimized PDF files hosted on various domains. The primary purpose appears to be to drive traffic to a link farm, likely for SEO manipulation or to host further malicious content. No scripts were extracted, and the document body is heavily obfuscated.

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://mail.superiorhhskc.com/uploads/1/3/0/7/130739443/130739443.html#first+person+shooter+games+for+android+free
    • http://miztcomedy.com/uploads/1/3/0/7/130739944/2124793.pdf
    • http://adenta.bg/uploads/1/3/0/5/130542937/2800259.pdf
    • http://ishiro.com/uploads/1/3/0/5/130551362/ketonipeluje.pdf
    • http://www.fontanapestpros.com/uploads/1/3/0/5/130551896/116068.pdf
    • http://webdisk.rentholycity.madesimplydev.com/uploads/1/3/0/2/130271078/tosozapedo.pdf
    • http://synchroski.org/uploads/1/3/0/7/130775629/8068074.pdf
    • http://apartmentapplication.net/uploads/1/3/0/5/130540104/6951059.pdf
    • http://bindboard.com/uploads/1/3/0/8/130813956/3455415.pdf
    • http://archdaily.us/uploads/1/3/0/2/130288731/3c78b87.pdf
    • http://christianhartsough.com/uploads/1/3/0/6/130639558/3193145.pdf
    • http://www.my-cotec.com/uploads/1/3/0/2/130287243/b4d0b024212a.pdf
    • http://mail.houndsofvrymeer.com/uploads/1/3/0/4/130483070/dugika-padizarop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d31.bin
f2fac71211af37ba9e89fb4eb0979445417964746afaad6b62754433df83a7a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D31 8664 bytes
font_01_sfnt_off0000ae49.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE49 2616 bytes
font_02_sfnt_off0000b77d.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB77D 16204 bytes

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