Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a29fe19c2de938…

MALICIOUS

PDF

66.8 KB Created: 2020-08-29 03:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db7efbfa0ebd34af1a4cb55819910103 SHA-1: f49c09db8317b0e4c0e0904a58564aa73d9f9d43 SHA-256: f4a29fe19c2de9381beeae4d5c11300055cdbeae9eaa21bdaee0d228d01dde90
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a redirector link to a known malicious domain. The document body, though heavily obfuscated, contains the same URL. The presence of multiple embedded links suggests a link farm or redirection strategy to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=zen+and+the+art+of+mixing+free+pdf
    • https://static.usrfiles.com/ugd/b8c837_175e6168f65b4591b5f64085f489e4f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_1279f4279e6c4c0781e816f778503051.pdf
    • https://static.usrfiles.com/ugd/b8c837_724c1e584b4c452cade4bc34705a6fc2.pdf
    • https://static.usrfiles.com/ugd/b8c837_00746bb3e7cd49f19d7059be2d01271d.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/mulewubusudufemipenakom.pdf
    • https://cdn.shopify.com/s/files/1/0431/1272/6677/files/ballard_score_interpretation.pdf
    • https://static.usrfiles.com/ugd/b8c837_d39ec767d9fd401c96806e6af0641ef4.pdf
    • https://static.usrfiles.com/ugd/b8c837_1bead4e9c68543a59eed809cbc10e605.pdf
    • https://static.usrfiles.com/ugd/b8c837_a573635522b04c1a9b154a6f71eb4ae0.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_off0000c891.bin
4ffc4a175af8f3fad7040abf0493645ddfc2c0d7c02403114e6a61b9a4dbe961		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 5268 bytes
font_01_sfnt_off0000da5e.bin
1263b89d2b2a8454b21879b6c1f3f93914974de549438e1bf778999a20cafecf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 10548 bytes

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