Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41857179c9aed4e…

MALICIOUS

PDF

42.5 KB Created: 2020-04-16 21:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bfce9da9a313b45135907add0fb860d7 SHA-1: a956562e5f8c4cc5379c290880abcf949e3bd998 SHA-256: a41857179c9aed4e3e6f418742c31e9f02cae2922c1c514f1055cd0773397d26
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous external links, many of which point to other PDFs hosted on similar domains, suggesting a link farm or redirection mechanism for malware distribution. The document body text, 'Buoyant force experiment form 4', is likely a lure to entice users to click on these malicious links. No scripts were extracted, but the PDF structure and numerous external URLs strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 3

  • 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
  • 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://cutiegoala.com/uploads/1/3/0/4/130488994/130488994.html#buoyant+force+experiment+form+4
    • http://depositionofficer.com/uploads/1/3/1/3/131378817/jovewazaxofozabagi.pdf
    • http://abrighterdaypediatrics.com/uploads/1/3/0/5/130546118/f316d2489.pdf
    • http://campowasa.com/uploads/1/3/0/7/130739936/6554031.pdf
    • http://mikelibonati.com/uploads/1/3/1/3/131383533/zikamafa.pdf
    • http://imaniashante.com/uploads/1/3/0/2/130291523/17c6e561a79.pdf
    • http://paulbaxteronline.com/uploads/1/3/0/5/130543472/43c0bc833ab6660.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_off00007bf7.bin
69745fb39a7bb89fbba491ac3c2815853fc508d850a7b48177b497aea9f92f2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF7 8996 bytes

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