Malicious PDF — malware analysis report

Static analysis result for SHA-256 0236a4db75f1fd99…

MALICIOUS

PDF

44.0 KB Created: 2020-09-03 01:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6212754b0dec21a6f31140d8aed3a7f8 SHA-1: 679a06910d2f64990ed1811ef0822565b261635a SHA-256: 0236a4db75f1fd993007a9caa1595ee8af816fecdf522a26b84c73cbea606a1b
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.me/wix?keyword=javascript+blob++dialog'. Additionally, it exhibits a lure for browser extension installation and a visual download button, indicating a social engineering attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.me/wix?keyword=javascript+blob++dialog
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e32576_09f13aa428da499c94946a4d69be6e2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f60e6bf37bba49bab33a35556f3a8162.pdf
    • https://static.usrfiles.com/ugd/b8c837_af10a04a980c4568ba22dc6c15a8475b.pdf
    • https://static.usrfiles.com/ugd/df4650_1a1557f68e1e4378800fbacb0667add4.pdf
    • https://static.usrfiles.com/ugd/18574e_87ab7259a660486895c408b813405880.pdf
    • https://static.usrfiles.com/ugd/eb4c03_4ab8347e00a740d2b97c7cda7119431d.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a42262263df4cbd8bf878a3eda5f33c.pdf
    • https://static.usrfiles.com/ugd/60933b_e09487b0e9524ba2ab937e42b1fdb5cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_a70d14e4017c4f3e9b472845f8e7e8a8.pdf
    • https://static.usrfiles.com/ugd/e481ce_0b17a919f76247a081cc675fb0116e72.pdf
    • https://static.usrfiles.com/ugd/77eba6_75fc9d5b9d8f4319a872c3095e7775d7.pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/jizowa.pdf
    • https://cdn.shopify.com/s/files/1/0437/0271/4536/files/adobe_reader_concatenate_files.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/gazizonobuxiwozugemaji.pdf
    • https://cdn.shopify.com/s/files/1/0459/6213/3663/files/azeotropic_and_extractive_distillation.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/addition_and_subtraction_of_fractions_worksheets_with_answers.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dba.bin
5c5d70cc9ba17382266fe39e60afc40be0ccc79a2fefe9735186ee2c2d25df8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBA 5432 bytes
font_01_sfnt_off00008043.bin
383ccd59c183cf2c186bdc1b176378f47c613bc8752c805d4a604533f2e3802d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8043 10132 bytes

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