Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d16ecee4bb45bf…

MALICIOUS

PDF

31.1 KB Created: 2020-05-21 20:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e28e63359da1e76c4c99b6c9314e40c SHA-1: 66bb5de4fe9876569871a5992a12e7f021d448e1 SHA-256: 31d16ecee4bb45bfdb5df16a5f6d1069c2a86cfa3a55a3ad479736200a55a44d
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are dynamically generated and point to suspicious domains. The document body text, though partially obfuscated, includes a lure related to 'free mp3 download' and references the PDF's creation tool, wkhtmltopdf. The presence of a PDF_SEO_LINK_FARM heuristic firing indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://74-123-78-242.mgwnet.com/uploads/1/3/0/3/130313161/130313161.html#jaheim+remarkable+free+mp3+download
    • http://memoriesonthemesa.com/uploads/1/3/1/8/131871745/wasepijajetevuw-buvuxepodijiwoj-numikunuw-wumowir.pdf
    • http://psychologuechatillon92.com/uploads/1/3/0/3/130323186/zadadoli.pdf
    • http://poetrinmotion.com/uploads/1/3/1/3/131383591/3149982.pdf
    • http://rayannashopeforafrica.com/uploads/1/3/1/3/131398357/jufofulowomezi.pdf
    • http://berufsakademie-mv.org/uploads/1/3/1/0/131071072/dugisataxip.pdf
    • http://mealplans-made-easy.com/uploads/1/3/0/8/130815115/9ad46c09c8f.pdf
    • http://bitsoglass.com/uploads/1/3/0/7/130776795/disiwapogedefe.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_off00004db1.bin
584c904fa33a1d7bf678b483dfbf4d5ed14aa56a578acb12161e32b88af3df20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB1 10604 bytes

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