Malicious PDF — malware analysis report

Static analysis result for SHA-256 965c75cf9b47cbff…

MALICIOUS

PDF

49.5 KB Created: 2020-08-31 07:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 237a127bd8dcef8d2c4d9b4fea4493b3 SHA-1: c2e5b928a3ce1e2b80c2f70828cc7a4442c04219 SHA-256: 965c75cf9b47cbffda7a9fab8651bd1adae284df9f85a242e20f5179cb0a14e7
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=lecture+analytique+gargantua+chapitr'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on various domains, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful 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=lecture+analytique+gargantua+chapitr
    • https://static.usrfiles.com/ugd/b8bbd7_56ebec7dea294a3f9e164b3ad0e235a9.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_8b1d164c5ca5491cbb55ce17cbd42410.pdf
    • https://static.usrfiles.com/ugd/b8c837_d68c6f48aa114e01934e7c0366e1c7f3.pdf
    • https://static.usrfiles.com/ugd/4bb894_0eb0c1a3ba404b5fa3a223e1a79e36a8.pdf
    • https://static.usrfiles.com/ugd/99965f_06bfba047f164d5abb82ec1906be2c13.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/rowakenudupadizozux.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5389/files/italian_job_soundtrack.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3062/files/kebokepanizofurug.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/52588587551.pdf
    • https://cdn.shopify.com/s/files/1/0438/7766/2875/files/client_services_representative_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/4850/8311/files/19385215031.pdf
    • https://cdn.shopify.com/s/files/1/0434/2992/0930/files/bsc_physics_honours_practical_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/83045652486.pdf
    • https://cdn.shopify.com/s/files/1/0432/9462/1862/files/determination_of_antioxidant_activity_by_dpph_method.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/anganwadi_form_haryana.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7031/files/zipunuvak.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_off00007f4c.bin
b40178afdfff9c2258693a27e7cc9d6ed3cd2aca512f55ef7b43f09f9894f1e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4C 5184 bytes
font_01_sfnt_off000090eb.bin
f267991a5de70296d5d0c5b6b68f7734f846489f5e88bb4b4f70ee3a69a187bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90EB 12344 bytes

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