Malicious PDF — malware analysis report

Static analysis result for SHA-256 285882d4de89ecd0…

MALICIOUS

PDF

33.0 KB Created: 2020-05-13 05:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dcd384aeec15d80f235d91758d102df3 SHA-1: 7fb9c71f2db3b247ce58d5335519e66ea5cebbf1 SHA-256: 285882d4de89ecd06a7b6ddabb7fdca4afdf72d22e3972f6c3c715376d60b75d
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, many of which are dynamically generated and appear to be part of a link farm designed to improve search engine rankings. One prominent link, 'http://holoholofuntravel.com/uploads/1/3/1/6/131636627/131636627.html#msi+afterburner+full+version+free', suggests a lure for downloading software. The ML classifier strongly indicated maliciousness, supporting the interpretation of this document as a malicious SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://holoholofuntravel.com/uploads/1/3/1/6/131636627/131636627.html#msi+afterburner+full+version+free
    • http://pledgeagainstbulling.com/uploads/1/3/0/6/130639914/1b127e00fcad2.pdf
    • http://onechoiceonelife.net/uploads/1/3/0/6/130605196/tunamisajato-vakodoguwokax-runesuvikubir.pdf
    • http://ilumes-imagine.com/uploads/1/3/1/4/131453016/wugiwutavozala.pdf
    • http://vivagroupusa.net/uploads/1/3/0/5/130590637/b735d5e.pdf
    • http://singularityventuresgroup.com/uploads/1/3/0/9/130969813/1f09ee09cd7e1.pdf
    • http://orianemckee.com/uploads/1/3/0/6/130639085/giwizorin.pdf
    • http://dramarathon.com/uploads/1/3/0/7/130738821/1862a109.pdf
    • http://alottapeople.com/uploads/1/3/0/9/130969339/2451462.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_off000057c9.bin
b700935a23a87c70b0f46dfb72ce7feab10936815c1364faee2fb7da217dfefd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57C9 9808 bytes

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