Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee51e94dfa9776ea…

MALICIOUS

PDF

70.9 KB Created: 2020-08-29 20:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0aa482df0916fa0524bb996c4801dc9f SHA-1: 3f49c14b277587d2c2f34b28fbcedb71844edfca SHA-256: ee51e94dfa9776ea928ae95d2004bdbb45c016c762384637c21a76742cfca5b4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that aligns with the observed malicious redirector. The presence of a PDF link farm further supports the conclusion that this document is part of a campaign to distribute malicious content.

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.com/wix?keyword=john+deere+165+mower+manual
    • https://static.usrfiles.com/ugd/b8c837_c7ceaabc4d1945d08c2a6225905d296a.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f92117751674146a6ad2d0bfaccd715.pdf
    • https://static.usrfiles.com/ugd/469aea_237f5c604c6f466b8aa2d7a2f9562b70.pdf
    • https://static.usrfiles.com/ugd/b8c837_a893d86f6e4d418c9d2891a3216b00b8.pdf
    • https://static.usrfiles.com/ugd/136d07_70a934f6c24c4ed695cb3cdeb29088d2.pdf
    • https://static.usrfiles.com/ugd/26938b_35df372a24b349ccac0449a70a8bda2f.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/answer_to_the_question_42.pdf
    • https://cdn.shopify.com/s/files/1/0452/0719/1701/files/barbarian_dnd_5e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b6e3b6021034155861f02ebd27a7b7e.pdf
    • https://static.usrfiles.com/ugd/a1fb72_6c1518b68df446cc89be48af7b3cf8d3.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_off0000d8ad.bin
cfe065ac39619a8931d3c1cb46d84723d806e6c329c698eef5a9236fe368687b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 5300 bytes
font_01_sfnt_off0000ea9a.bin
ab546f4cd7d29cf0377974a534fb99872f6f09fb4492d1aba167bbd3fe916964		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 10764 bytes

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