Malicious PDF — malware analysis report

Static analysis result for SHA-256 528097f62244b690…

MALICIOUS

PDF

53.2 KB Created: 2020-04-07 12:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c9b0b082355020dc27e9d4b3947d1997 SHA-1: 95a2c876ec1a22ba6b952fdbbcb8b56239580c84 SHA-256: 528097f62244b690f1277ec0efc0720466bd87f9820ecc2d666764f8c8359725
94 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, a technique often used for SEO link farming or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. The document body, though obfuscated, contains URLs that are also present in the heuristic findings, suggesting a coordinated effort to drive traffic to these sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://app-pof.com/uploads/1/3/0/7/130739867/130739867.html#power+yoga+sequences+vinyasa
    • http://evakatebiz.com/uploads/1/3/0/3/130323754/09163bf68488.pdf
    • http://sdsuprojectsearch.com/uploads/1/3/0/5/130539465/fawus-xaxotapojatiles-tuvutizodigu.pdf
    • http://mosaicsbystacey.com/uploads/1/3/0/5/130539046/safikunef_mopalawekufaju_jowej.pdf
    • http://facco.me/uploads/1/3/0/4/130483285/6371733.pdf
    • http://thevisualnarrative.com/uploads/1/3/0/8/130873903/bffbcbe08a64fe.pdf
    • http://prophecygod.com/uploads/1/3/0/6/130621780/lijox.pdf
    • http://chestnutmedia.com/uploads/1/3/0/9/130969678/6619603.pdf
    • http://citychurchcenter.org/uploads/1/3/0/6/130639998/tigalukiguwej.pdf
    • http://kenbroglobaltech.com/uploads/1/3/1/4/131413040/2fbceb.pdf
    • http://siddixit.com/uploads/1/3/0/6/130639593/f3c629ab0f6.pdf
    • http://agrowz.org/uploads/1/3/0/9/130969510/584216.pdf
    • http://mohamoudegal.com/uploads/1/3/0/6/130604542/dibar.pdf
    • http://whoisnecessityschild.com/uploads/1/3/0/3/130323674/1577344.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_off000090dc.bin
9bf066fa8b7c27d32f642004eb3ed5de3302f08e8f2542704022837750eee173		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90DC 8820 bytes
font_01_sfnt_off0000b2a6.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A6 16036 bytes

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