Malicious PDF — malware analysis report

Static analysis result for SHA-256 900e2d4078e0f2cc…

MALICIOUS

PDF

37.0 KB Created: 2020-04-12 21:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ec0a6decef7e2058758190339e72721b SHA-1: a6313ef4aafba70d1eff723a4d83b35b1779d67a SHA-256: 900e2d4078e0f2cc11adf5ba8a586a57e6ed57d35eed9f021c0b5cdaa0e7cba5
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains. This pattern is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for harmful sites. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the 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://ewaveinc.com/uploads/1/3/0/4/130483295/130483295.html#urban+beatz+tundra+review
    • http://thehburg.org/uploads/1/3/0/7/130775214/gorak.pdf
    • http://ineedabookkeeper.co/uploads/1/3/0/8/130814631/guretakerite_vupusab.pdf
    • http://gmbell.com/uploads/1/3/1/0/131070073/bufiju.pdf
    • http://centrodepaz.net/uploads/1/3/1/4/131453130/wofavowusogeruwazi.pdf
    • http://mytryshyn.com/uploads/1/3/0/4/130435734/53e652.pdf
    • http://holidayfarms.org/uploads/1/3/1/3/131383936/rosozusadafogir-vesumodibax-bonavat.pdf
    • http://ihrlandschaftsg�rtner.de/uploads/1/3/0/4/130436288/nesukesas.pdf
    • http://miriamemcc.com/uploads/1/3/1/1/131164321/netajo.pdf
    • http://midnaetur.com/uploads/1/3/0/5/130540585/lepuw-lisefupuvifu.pdf
    • http://highlandhouseofcambridge.com/uploads/1/3/0/5/130590456/72f81c60127e6.pdf
    • http://habitationworship.com/uploads/1/3/1/3/131398053/vawabomujozejubikise.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_off00005293.bin
4b96fcc630e1368e94b9fa6ca8b9e2ed710f7e82f642ef31e4c409cb78f62711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5293 8216 bytes
font_01_sfnt_off00007258.bin
5df8447ccddf7aa392d42d8154b7ef928f4157a253b0c910c224979b6e97d754		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7258 16204 bytes

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