Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f398d0196828fe8…

MALICIOUS

PDF

43.4 KB Created: 2020-08-29 21:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0de36405ffc4685a4e5ad55b984db5d0 SHA-1: fe998e1e9e84fcd3807d51170d14870cc5ce41e5 SHA-256: 2f398d0196828fe8c9caa1880c55824a15520d9848a765bd724dd45e6ee1276a
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a common tactic for SEO poisoning or link farming. One of these links, https://ttraff.club/wix?keyword=mvc+jsonresult+return+json, is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links, including a confirmed malicious redirector, suggests an attempt to lure users to malicious websites.

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=mvc+jsonresult+return+json
    • https://static.usrfiles.com/ugd/b8c837_92a9a8818da742069e763b7a136ede4c.pdf
    • https://static.usrfiles.com/ugd/98e298_ffd4fc7d9f18417da8b9b2cc3e608b8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6d5eecba3124a9682269b690e4c0864.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb558c8f0f5940cc88973621baa03895.pdf
    • https://static.usrfiles.com/ugd/fbccce_7afa35d1746d4ad49c523eb0184cbf90.pdf
    • https://cdn.shopify.com/s/files/1/0464/7301/9560/files/general_knowledge_questions_and_answers_pakistan.pdf
    • https://cdn.shopify.com/s/files/1/0437/2620/9175/files/38523749497.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6378/files/solving_absolute_value_equations_guided_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/minecraft_debug_command.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/internship_report_on_web_development.pdf
    • https://cdn.shopify.com/s/files/1/0462/5504/6807/files/cambridge_damtp_example_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/0709/0581/files/4120807484.pdf
    • https://cdn.shopify.com/s/files/1/0431/9268/0611/files/c_b_p_o_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/9395/8560/files/59753413083.pdf
    • https://cdn.shopify.com/s/files/1/0434/6049/3474/files/13121043222.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7511/files/95653459654.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000620d.bin
93c47dcdb69f8ce39c9ddc8dfd4b857226b1f62bb4b908a88db85e1d71ee06c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x620D 4724 bytes
font_01_sfnt_off00007231.bin
e2d1362239547220ebb090ebe9ee02d6b7333fba2b689c34bb6f6dbf96c85160		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7231 1820 bytes
font_02_sfnt_off00007b0c.bin
9d8032b08537a203ab0cb76906994b7526ed212cab78cfe10dc8b4c1e5bdee20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0C 11088 bytes

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