Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24bac3df9e4caef…

MALICIOUS

PDF

66.4 KB Created: 2020-06-22 19:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd2f96e21caa86bd264c42087c6f5418 SHA-1: 5dfd0913fa0380f14383e5c26b2c19d3d5a26bcf SHA-256: a24bac3df9e4caefa89292bb1f83f83feeaf1e505aeabf2a90300516b84add55
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files on various domains. This behavior is indicative of a link farm or SEO poisoning attack, designed to drive traffic to potentially malicious content or to manipulate search engine rankings. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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://crazy8sbilliards.com/uploads/1/3/2/7/132741214/132741214.html#tv+guide+louisville+kentucky
    • http://yesshecancampaign.com/uploads/1/3/0/5/130589156/tedutajisog.pdf
    • http://jdkd9f012asdf8ub.com/uploads/1/3/0/5/130588728/cb6d1.pdf
    • http://biblestudyforall.org/uploads/1/3/0/6/130620712/tosabutajo.pdf
    • http://kodexbuch.de/uploads/1/3/1/0/131070722/9137512.pdf
    • http://infinity-math.com/uploads/1/3/0/2/130289595/fixedupewajoli.pdf
    • http://mail.literacyandbeyond.org/uploads/1/3/0/6/130604198/renilulijuno-budirogo-tavenewebevavu.pdf
    • http://autodiscover.margaretmorrisonhighlanddance.com/uploads/1/3/0/5/130545818/25e9323a46deeb3.pdf
    • http://ecuriebarnton.com/uploads/1/3/0/7/130739260/7088533.pdf
    • http://klgovaffairs.com/uploads/1/3/0/4/130476984/nibewukegupiza.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_off0000c5df.bin
87494cb4ff2749be1eea4aeb23a1d9eb758ae15b36c3b74c66efe85bdb7378bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DF 4856 bytes
font_01_sfnt_off0000d687.bin
946f20f30c230847948d29186a992a749d203cca9f3ac907709954ce588b247f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 11516 bytes

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