Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2146703902c6331…

MALICIOUS

PDF

38.3 KB Created: 2020-04-02 05:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c6d5fa870ef4116f9e35eb1c91bc3c6d SHA-1: d2e2d471efbae8f64917267b5fc7a202e17d1a6f SHA-256: b2146703902c6331afb91e72efdfdca371edbdcaa5cbd1adbdb40b50ac90dd99
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 Malicious Link

The PDF contains a large number of external links, many of which point to other PDF files hosted on similar domains. This pattern is indicative of a link farm or SEO poisoning attack. The ML classifier strongly supports the malicious nature of this document. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of its specific intent beyond link distribution.

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://miracleinabucket.com/uploads/1/3/0/8/130874475/130874475.html#yamaha+natural+sound+av+receiver+rx-v363
    • http://fordtayninh-online.com/uploads/1/3/0/3/130379696/mametonixatugizir.pdf
    • http://developmentechnwkllc.com/uploads/1/3/0/4/130483047/tuvopenix.pdf
    • http://meaganmurrayauthor.org/uploads/1/3/0/4/130483142/3650960.pdf
    • http://groundhost.xyz/uploads/1/3/0/2/130289476/vojoxiwo.pdf
    • http://pens4swordspublishingonline.com/uploads/1/3/0/2/130289589/aed84d44b9d31b.pdf
    • http://wssdar.com/uploads/1/3/0/9/130969036/lulibi_warixelexo_pafoxalezazosak.pdf
    • http://21stcenturyacademy.info/uploads/1/3/1/4/131407158/duwub-gifuvunutag.pdf
    • http://coldcurve.net/uploads/1/3/1/3/131383649/babava.pdf
    • http://massotherapeutequebec.ca/uploads/1/3/0/9/130969455/1315117.pdf
    • http://ramencranford.com/uploads/1/3/0/3/130323324/2136304.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_off00006bb3.bin
76c2961f180b2d556ac698e0ada1e6c7814e155059326fa24d6d72a241298962		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB3 8420 bytes

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