Malicious PDF — malware analysis report

Static analysis result for SHA-256 75959e14bfd3f122…

MALICIOUS

PDF

43.1 KB Created: 2020-08-31 06:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb6a26c087b47a3d123acd7314a1d332 SHA-1: e39871a9a001fdefeb6a08ce2789d3213cc89fc7 SHA-256: 75959e14bfd3f122d20e4efeff9c399fbbe16435365cfa4b1dc6aa11946fda2f
154 Risk Score

Malware Insights

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

This PDF file contains numerous links, including one to a known malicious redirector at 'https://ttraff.ru/wix?keyword=making+predictions+worksheets+5th+grade'. The document body, though heavily obfuscated, appears to contain similar URLs, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness. The primary attack vector is likely spearphishing attachment, leading to the redirection to malicious infrastructure.

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.ru/wix?keyword=making+predictions+worksheets+5th+grade
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/136d07_10afc2f4e1b74131ada3ca5fb56d9d9a.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf47ea6b1b8442ee9c2bcdc31cafbbe3.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e274c87c17b4c05b8a8f33dbef06cbe.pdf
    • https://static.usrfiles.com/ugd/b8c837_69448f931abd48f8b1328e491304ecdb.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7ceaabc4d1945d08c2a6225905d296a.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d6deec0ed734868ab6adadb3c7a2167.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_5b1a2c9de3af4a1797fd4b5180bed8d7.pdf
    • https://static.usrfiles.com/ugd/f55bec_5c104dccfc8f4942a9926b29a19bfbef.pdf
    • https://static.usrfiles.com/ugd/b8c837_0eb317c6c08c4944bd06ab3bc6abdd0e.pdf
    • https://static.usrfiles.com/ugd/3dd68e_91fb96d018bb4d64bcd9d92895535088.pdf
    • https://static.usrfiles.com/ugd/a4e402_67b803093b12466eaee2f3e09d520607.pdf
    • https://static.usrfiles.com/ugd/374ce0_43a773afcd13418ebe1c96d35dae5f0f.pdf
    • https://static.usrfiles.com/ugd/b8c837_17995a2bf20845c4b2eb9345ba82413d.pdf
    • https://static.usrfiles.com/ugd/a4d998_d86e7d938ca549cfab715f126a1329fe.pdf
    • https://static.usrfiles.com/ugd/d5cf39_83e6519661894583854142137eb15fbb.pdf
    • https://static.usrfiles.com/ugd/61804c_8f72a486a6ca45c6b3e5aaf89da8c48a.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c0d.bin
ecebd78fa06aa63860fddd130999c91247a1e7d7b0b24505b06cb3fe68ea56c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0D 5376 bytes
font_01_sfnt_off00006e64.bin
ce8c948f72a3268af0b3135886da4a1efea2f30d47b41f0cf9eda98fd4ea3db4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E64 10268 bytes
font_02_sfnt_off0000916c.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x916C 4324 bytes

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