Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbceff3afa1415a9…

MALICIOUS

PDF

32.1 KB Created: 2020-05-14 22:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2754b7d18a5ec90dc195e46cb74161a5 SHA-1: 211d9add5fea9ad880caf1487618ca1e75816d88 SHA-256: dbceff3afa1415a9a45bc17623f83dd640c788bd48b775e46d3abf68c268d2ab
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of embedded external links, a technique often used for SEO poisoning or to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body's content appears to be a lure, possibly related to sheet music, to disguise the malicious intent of directing users to numerous external PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://rhiannongower.com/uploads/1/3/0/6/130620818/130620818.html#be+alright+dean+lewis+sheet+music+free
    • http://chilwilradio.com/uploads/1/3/0/4/130475973/e0d34e0d60aed.pdf
    • http://aquabellasupply.com/uploads/1/3/0/6/130640021/6b7aeb6d1b86c73.pdf
    • http://blockfortcolumbus.shop/uploads/1/3/0/6/130605253/tovodekibejuba.pdf
    • http://alrmooz.com/uploads/1/3/0/8/130814193/9004937.pdf
    • http://slaphappymedia.com/uploads/1/3/1/4/131411987/nekubogetonalumuko.pdf
    • http://clteast.com/uploads/1/3/1/4/131407310/zirurusuromuxi.pdf
    • http://oneocean.biz/uploads/1/3/0/5/130588366/sojug_dulat_xuzax.pdf
    • http://ashley-champagne.com/uploads/1/3/1/4/131437379/powewopobabizedure.pdf
    • http://thailandsbestnavarre.com/uploads/1/3/0/6/130603715/2c4167.pdf
    • http://magicaltrappings.com/uploads/1/3/0/6/130604881/fejozowo-xifite.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_off00004f25.bin
e6e7478eb8fa5d7f2302f3825a9f545fb6d0ac7137ebfb9c7c84582b8ba46a72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F25 11928 bytes

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