Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6b82e37ecd0f4d…

MALICIOUS

PDF

46.1 KB Created: 2020-04-09 17:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb5d4b044c42de1515ddbaf7c674b515 SHA-1: 0ff60d9ab714e0a3175ccf3c7a0c3d0fa8d94de8 SHA-256: 6a6b82e37ecd0f4d6f24045260b4a574fcbe18668be8af600c608f02279fd424
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many of which point to other PDF files hosted on similar domains. The primary heuristic indicates this is a link farm, likely intended to generate traffic or serve as a distribution point for further malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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://arcflashstudies.net/uploads/1/3/1/4/131437881/131437881.html#no%24gba+emulator+pokemon+emerald+cheats
    • http://lavigneridge.com/uploads/1/3/1/3/131384016/telogumunifogemuf.pdf
    • http://www.botoxdoylestown.com/uploads/1/3/1/1/131164038/8242615.pdf
    • http://engenhariadopao.com/uploads/1/3/1/4/131454155/buvimuduj_botumes.pdf
    • http://hiitech.org/uploads/1/3/0/6/130639782/zixoduxewobolivogudi.pdf
    • http://heritagetrainingsystems.org/uploads/1/3/0/4/130483318/gatonawafuguroja.pdf
    • http://rareelegance.net/uploads/1/3/0/3/130323106/5405257.pdf
    • http://sheisblankspace.com/uploads/1/3/0/7/130775800/69cddca1.pdf
    • http://vitreous.cc/uploads/1/3/1/3/131380354/a85161d7dcda.pdf
    • http://rjfitnessokc.com/uploads/1/3/0/5/130539249/1513426.pdf
    • http://lifeafterlife.online/uploads/1/3/0/7/130739460/piwosibifakubavu.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_off00008a4e.bin
058e2012273fa0c79b8aa3f620f6d101fb076b48f154212af29306358c93d4f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4E 8720 bytes

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