Malicious PDF — malware analysis report

Static analysis result for SHA-256 460c349cf31862e8…

MALICIOUS

PDF

36.3 KB Created: 2020-04-15 20:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9b65b7f80bf78630f463eb66bc943ce7 SHA-1: b2815fa9b2f29ccaf6387bfc0734fe9d2700d145 SHA-256: 460c349cf31862e87929980aa251061d695e711cbf06f3c6e82528609efacf19
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common tactic for SEO poisoning and distributing malicious content. The document body, though heavily obfuscated, contains a URL that mirrors the title 'English punctuation exercises with answers pdf', suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous unknown URLs reinforces the assessment of a malicious distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://referral360network.com/uploads/1/3/0/6/130604091/130604091.html#english+punctuation+exercises+with+answers+pdf
    • http://macreedy.com/uploads/1/3/1/4/131406146/gegumovevasesez.pdf
    • http://webmail.bold-essentials.com/uploads/1/3/0/5/130539875/5123255.pdf
    • http://kbmassageandwellness.com/uploads/1/3/1/3/131378921/4910184.pdf
    • http://e-socratos.com/uploads/1/3/0/8/130813398/5536429.pdf
    • http://mobilitydream.com/uploads/1/3/1/3/131380495/6244644.pdf
    • http://nanoquests.com/uploads/1/3/1/4/131453869/fatozutuzi.pdf
    • http://rdn-artdesign.com/uploads/1/3/0/6/130604858/9892000.pdf
    • http://mrsjanebrooks.com/uploads/1/3/0/7/130738759/3997262.pdf
    • http://allberta.com/uploads/1/3/0/7/130776755/gaxitaf-vagurux-fujaga.pdf
    • http://nanoquests.com/uploads/1/3/1/4/131453869/fa
    • 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_off00006446.bin
3cd13dcf6ba20cfa3985fa32ecfc731ddb9da30283f45e0a4c4a9d08ce5ad961		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6446 8536 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.