Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9760b1f184a32bf…

MALICIOUS

PDF

43.2 KB Created: 2020-09-01 19:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3730237497645f8ae47fe9de6043b4ed SHA-1: 5ba1374cd76031926b2bac2fdbc44f58952d6005 SHA-256: d9760b1f184a32bfc2c14236b718f3c52d41811d11f7d3ec4f1dac6b2e7d2bc3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.club/wix?keyword=speed+for+hd+streaming'. Another heuristic indicates a large number of external PDF links, suggesting a link farm for SEO manipulation or malware distribution. The ML classifier strongly supports the malicious nature of this PDF. The document body, though heavily obfuscated, contains the malicious URL and references to streaming, reinforcing the lure.

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=speed+for+hd+streaming
    • https://static.usrfiles.com/ugd/2274a7_74a6638846cd4c379b1a9d40a487d3f2.pdf
    • https://static.usrfiles.com/ugd/e42ee3_658d924a4100425e8efbe457d69f2864.pdf
    • https://static.usrfiles.com/ugd/b8c837_f233452c5c7f4ad3997400f5b8f625a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_490aa790dd5a4d7a8d9506a8d4864a6d.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6560a86dbcf4117848d2f1d9867529d.pdf
    • https://cdn.shopify.com/s/files/1/0436/1800/9250/files/standard_concrete_mix_ratio.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4661/files/lotuloxupuj.pdf
    • https://cdn.shopify.com/s/files/1/0438/3624/4118/files/35386464984.pdf
    • https://cdn.shopify.com/s/files/1/0428/5156/5724/files/62040334099.pdf
    • https://cdn.shopify.com/s/files/1/0447/1750/6716/files/interview_job_questions.pdf
    • https://static.usrfiles.com/ugd/d4579c_a9c245dc25844c2d83e46c0c3ad7e8aa.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_99b66dbf77ef41a9b68f17e620fee4cb.pdf
    • https://static.usrfiles.com/ugd/724bd4_67fb7ccd6d50417c84af0479c490314d.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/experiments_in_general_chemistry_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/6815/3239/files/ximewut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/80490740576.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/
    • https://static.usrfiles.com/ugd/d4579c_a9c245dc

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069ff.bin
a380cda493ea7897b9faff7a4414d9f701691847df73b9be13e0d90df6fce92b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FF 5524 bytes
font_01_sfnt_off00007c9d.bin
82e43ef558824ef6620dacbb5b516c0e60c49a87cec5f9d2c2a05f8b876ecf45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9D 10292 bytes

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