Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a82f6615504ee2…

MALICIOUS

PDF

42.8 KB Created: 2020-04-05 06:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 07e94a07dda707d592f07003561f87db SHA-1: 8f9d5b65900057531c22cd8d29c444a7776c1f0d SHA-256: 90a82f6615504ee2ab355b727170ac15e441a196616aabeedb4b7fc0b51c3bd6
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness. The primary purpose appears to be hosting a link farm, directing users to various external PDF files, likely as a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mariskavanoijen.nl/uploads/1/3/0/8/130813025/130813025.html#building+an+outhouse+poem
    • http://masterneuroplasticity.com/uploads/1/3/0/5/130590336/dirotuwalo.pdf
    • http://colbuiltconstruction.com/uploads/1/3/0/7/130739026/jorozaropawak.pdf
    • http://melonfry.com/uploads/1/3/0/4/130488741/27c8819b498ef.pdf
    • http://vipartytokyo.com/uploads/1/3/0/6/130604737/d03ba75b5091d5.pdf
    • http://onthefieldsports.com/uploads/1/3/0/6/130604687/30675e.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_off0000811c.bin
fe9872b34dd983fea7246fc7c475295d340374d6aecfa4ffc96ee0e2e306518c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x811C 7656 bytes

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