Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c1f7af3f8bb0ed…

MALICIOUS

PDF

43.9 KB Created: 2020-08-30 02:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19a4700c57189f034b515559e962933c SHA-1: 6ad9b160bf22c4ce9bf9677f9ea7905b8453be1c SHA-256: 84c1f7af3f8bb0ed98a470cd96a923337704aa3abfdaa06b95554ceb2dc37e94
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a redirector link to 'ttraff.club'. This suggests the document is designed to redirect users to a malicious site, likely for phishing or malware distribution. The presence of numerous embedded URLs, many pointing to 'static.usrfiles.com', further supports the idea of a link farm intended to obscure the malicious destination. No scripts were extracted, but the overall structure and the critical redirector finding strongly indicate a malicious intent.

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.club/wix?keyword=ukulele+chords+pdf
    • https://static.usrfiles.com/ugd/b8c837_d698581ab6b34881bb95e69b237368cf.pdf
    • https://static.usrfiles.com/ugd/3e87bf_4675c148c3154673964e81c1a8ebacb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_2100d23ced5a494985e5751a87342560.pdf
    • https://static.usrfiles.com/ugd/b8c837_d82adfd76b7f42a78f74ed560df4652e.pdf
    • https://static.usrfiles.com/ugd/cd79e3_ab21f66e2cf14c818ea893079002cc8e.pdf
    • https://static.usrfiles.com/ugd/b8c837_82d68c2fe8a948b0bf6390ae701f5144.pdf
    • https://static.usrfiles.com/ugd/3b0c81_0242e7925c004184a3897c10aefb6002.pdf
    • https://static.usrfiles.com/ugd/e2c250_466196e7937d4dddb32e9f12028f3fa6.pdf
    • https://static.usrfiles.com/ugd/b8c837_fea7b79cd52c4594bcfd75c3de00e607.pdf
    • https://static.usrfiles.com/ugd/b8c837_49125088aa2249d98fcd5d7697daa921.pdf
    • https://static.usrfiles.com/ugd/9cb927_d5649b9e85e94680a21b5f7eb0572abe.pdf
    • https://static.usrfiles.com/ugd/a771bd_9c2f60275f4e4f1d8742babf11495835.pdf
    • https://static.usrfiles.com/ugd/b8c837_facd8f0f98a144e2b13d908f4d4011ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8a150c37262438780fc918b9154f90a.pdf
    • https://static.usrfiles.com/ugd/73f3b0_da21c112c55c43d59e3c44ab0c009fda.pdf
    • https://static.usrfiles.com/ugd/33a2e4_3b09c0dc9d064520acf57fcee67192a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_3992f4899eea425a980c7a2b4f71d678.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_off00006de3.bin
345cf7870ea0a571ccdd4825bed3c0a7ab48a98ff3ad5a9dc14f1c5aeb64d8e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE3 5088 bytes
font_01_sfnt_off00007f32.bin
67c35b98c72c3012b1e02399b7df3565fee21de55378b6bfaa6a8824cb8bd36a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F32 10412 bytes

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