Malicious PDF — malware analysis report

Static analysis result for SHA-256 02993ee77ebbab2e…

MALICIOUS

PDF

39.6 KB Created: 2020-04-15 09:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0bc64f491a75343ea94b860d444f1123 SHA-1: dc3dd11e6ced25f8311feb1001676d5bcc5b2d91 SHA-256: 02993ee77ebbab2e1dd96a548a0587eb4c6e0d2b4b785e8acee5a0353a381fb7
96 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection scheme. One prominent link, 'http://teamjoe.net/uploads/1/3/1/3/131379716/131379716.html#shazam+for+pc+windows+8', appears to be a lure for software downloads. The ML classifier strongly indicated maliciousness, and the PDF structure with mass external links is a common tactic for distributing malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://teamjoe.net/uploads/1/3/1/3/131379716/131379716.html#shazam+for+pc+windows+8
    • http://ranisdesigns.com/uploads/1/3/1/6/131637691/kiratavusoja.pdf
    • http://onenicholasryan.com/uploads/1/3/0/7/130739517/buwolado.pdf
    • http://viperfishentertainment.net/uploads/1/3/0/7/130775590/91ec6d34976c5.pdf
    • http://indigoandbirch.com/uploads/1/3/1/4/131483830/gasofumexetub.pdf
    • http://steinerdinerlcws.com/uploads/1/3/0/2/130289625/3685010.pdf
    • http://revivetheroxy.org/uploads/1/3/0/6/130639690/3454279.pdf
    • http://warrentonprep.com/uploads/1/3/0/6/130620781/06b9115c.pdf
    • http://genderandconflict.gmu.edu/uploads/1/3/0/9/130968973/da23b015e027.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_off000073d5.bin
81ed1e3f3a6ca6b7b3a9c8a637ea0a850ea335760dc212a5dd0158feae0b8b73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D5 8060 bytes

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