Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76cb7c7e517c6ce…

MALICIOUS

PDF

45.9 KB Created: 2020-08-06 14:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29affdd90b3a204239f8e10b9925ec0a SHA-1: 74ccb012b64e760d57b47fefa56dd7484985e82a SHA-256: b76cb7c7e517c6cede4f4809a16753e709314850794bd2725d5c29c0f495cf13
202 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=importance+of+job+analysis+in+hrm+pdf'. This, combined with a heuristic for a remote-support tool lure and a browser extension installation lure, indicates a social engineering attack. The document body, though heavily obfuscated, contains the same URL and numerous other PDF links, suggesting a link farm designed to trick users into downloading further malicious content or visiting malicious sites.

Heuristics 5

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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
  • 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/pify?keyword=importance+of+job+analysis+in+hrm+pdf
    • http://files.michaelwarrenmurphy.net/uploads/1/3/1/4/131454012/regezewowif-wofenur-puvuvinaveloxi-vugim.pdf
    • http://files.silkroadresearchcenter.org/uploads/1/3/1/4/131438708/1bf520.pdf
    • http://files.andrewbroomphotography.com/uploads/1/3/0/7/130775310/9be3c5b88fd891.pdf
    • http://files.tyrarexin.com/uploads/1/3/1/1/131164399/nusegerotu.pdf
    • http://files.flaseal.com/uploads/1/3/1/4/131437157/vikozipoxerukul_jisose_pewizubuzuwi_votodinukipesuj.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/zoxojakusadefozavetolewe.pdf
    • https://cdn.shopify.com/s/files/1/0428/8669/3023/files/42242842907.pdf
    • https://cdn.shopify.com/s/files/1/0433/2234/3577/files/33133548548.pdf
    • https://cdn.shopify.com/s/files/1/0441/0766/1464/files/aphasia_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/48392201225.pdf
    • https://cdn.shopify.com/s/files/1/0434/4945/0663/files/zadot.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5797/files/roturexelozegefinomutesa.pdf
    • https://cdn.shopify.com/s/files/1/0433/1801/8216/files/jelojunaropow.pdf
    • https://cdn.shopify.com/s/files/1/0431/7010/3452/files/kogarituzizu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2814/3510/files/25485261913.pdf
    • https://cdn.shopify.com/s/files/1/0441/2702/7352/files/office_building_design_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0430/7301/1863/files/the_strange_case_of_benjamin_button.pdf
    • https://cdn.shopify.com/s/files/1/0433/0926/9156/files/72741752435.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_off0000751e.bin
2fdf4daba9ffdde887397e6e57c6e4f70219bb02b7958864a2799cbf747bb342		 pdf-font-stream PDF embedded font (sfnt) at offset 0x751E 5648 bytes
font_01_sfnt_off0000882c.bin
e4d97d21dc3c8d222f29cd935ab20f7603805b2b82d3157bc2d480c3cdb7bf25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x882C 10076 bytes

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