Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dce6842ae79496d…

MALICIOUS

PDF

43.5 KB Created: 2020-08-29 05:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f731e44b78669b3ffc228ef9afaab983 SHA-1: 66f357eb3908ac5df5851fd7ea7b2f827155c5cd SHA-256: 9dce6842ae79496d5e6a7fe369baf1f494e8343b947dc89fd72edeebef71525a
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The embedded URL points to a known malicious redirector, likely intended to lure the user into clicking and visiting a malicious site. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://ttraff.cc/wix?keyword=estudio+de+mercado+investigaci%25C3%25B3n+y+segmentaci%25C3%25B3n
    • https://static.usr
    • https://static.usrfiles.com/ugd/b8c837_52420dc35d35428d9fabd42195870765.pdf
    • https://static.usrfiles.com/ugd/b8c837_69864e2194be4bcab8c9cf96bf64d9ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2876952825b457697e95e261c323dd3.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c233d354fe64dada2b3fdf429ede4d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_478ef8dea919480d9464e6ab8d2cf77f.pdf
    • https://static.usrfiles.com/ugd/b8c837_a840dfc8ee1247688c43a3f04f392573.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e8281d17f484757a0ac67e31cd9e44d.pdf
    • https://static.usrfiles.com/ugd/b8c837_597443141cdd4dd08befe21a0b7ad014.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b66c7751e714042a13b12e666979b85.pdf
    • https://static.usrfiles.com/ugd/b8c837_0293ed1d42d642e9af2d33260aeb818b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006832.bin
043b7edbb584534c738cb3565ccf452592d53ba4de48f8f918d8c185db18a4a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6832 5484 bytes
font_01_sfnt_off00007a8e.bin
9dc6a1e64e585d1727ca087db0be5de650f74a3038c94125228321575b638645		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8E 11104 bytes

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