Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafc5c3124864710…

MALICIOUS

PDF

36.2 KB Created: 2020-06-06 18:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11123de9d36408e3d1146d6b722ec9c7 SHA-1: 962ab53d3d6e9899bbdd082f4249a88a7d9e5b93 SHA-256: bafc5c3124864710560c7252b8cbd6eaba7bf28eab7fdd4759673d5e6c6311e6
94 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to domains suggesting a link farm or SEO manipulation tactic. The document body, though partially corrupted, contains text related to a movie title ('Ong bak 3') and the authoring application 'wkhtmltopdf', indicating a lure to external content. The presence of multiple PDF links and the ML classifier's high confidence score suggest a malicious intent to redirect users to potentially harmful sites.

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://thebestmanyoucanbe.com/uploads/1/3/1/4/131437198/131437198.html#ong+bak+3+t%25C3%25BCrk%25C3%25A7e+dublaj
    • http://michelinlegal.com/uploads/1/3/0/2/130291491/b2290fd8066ab.pdf
    • http://bettertroutponds.com/uploads/1/3/2/3/132302735/5198f62bdf.pdf
    • http://caseforoptimisim.org/uploads/1/3/1/6/131636745/2341898.pdf
    • http://thebestmanyoucanbe.com/uploads/1/3/1/4/131437198/terms.html
    • http://thebestmanyoucanbe.com/uploads/1/3/1/4/131437198/dmca.html
    • http://thebestmanyoucanbe.com/uploads/1/3/1/4/131437198/policy.html
    • https://judirowekeva.files.wordpress.com/2020/06/jojinezaleli.pdf
    • https://mepizirule.files.wordpress.com/2020/06/89756169805.pdf
    • https://gegiguwesaf.files.wordpress.com/2020/06/54206975771.pdf
    • https://sinegimagex.files.wordpress.com/2020/06/lirozuretixulub.pdf
    • https://futuxew.files.wordpress.com/2020/06/tasubutirerotuvi.pdf
    • https://ronoretexupo.files.wordpress.com/2020/06/55196789549.pdf
    • https://wefozeb.files.wordpress.com/2020/06/36656954567.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_off00005e8a.bin
8e0779aafa9f45abfead0ffc71fbb8a1845c184c7c48cfb07fe0caf2a0901962		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8A 12056 bytes

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