Malicious PDF — malware analysis report

Static analysis result for SHA-256 991e5ce7696c3d3f…

MALICIOUS

PDF

41.6 KB Created: 2020-09-01 08:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bbadf650b70a86bcf344e48b303cf48 SHA-1: 96a22cfdd39d1c9812c272fa6b19b3562487fd09 SHA-256: 991e5ce7696c3d3f30e64d97f1a6d9680a0ea95a16d009f3d0309183782769b9
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=free+textures+for+3ds+max'. This URL is presented within the document body, disguised as a resource for 3D modeling textures, indicating a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links, many pointing to benign Shopify domains, likely to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/wix?keyword=free+textures+for+3ds+max
    • https://cdn.shopify.com/s/files/1/0436/7358/3781/files/hypoglycemia_australian_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0429/0071/7727/files/81178499351.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0498/files/rujuvupidaguvedalolav.pdf
    • https://cdn.shopify.com/s/files/1/0437/2470/1845/files/ielts_writing_task_1_academic_answer_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/2328/5920/files/meforuromelipigawinarip.pdf
    • https://cdn.shopify.com/s/files/1/0432/3144/5149/files/remove_metadata.pdf
    • https://cdn.shopify.com/s/files/1/0429/6802/3194/files/48793357303.pdf
    • https://cdn.shopify.com/s/files/1/0437/3371/3050/files/dagedajilijonobusimedepoz.pdf
    • https://cdn.shopify.com/s/files/1/0427/8157/3279/files/21764086367.pdf
    • https://static.usrfiles.com/ugd/d5415a_7a0f208217b7471280110f93af9569a1.pdf
    • https://static.usrfiles.com/ugd/f55bec_a019b89097d04ca3ac8852414e21113d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3af5d69f79524033a29d31b85a9af94a.pdf
    • https://cdn.shopify.com/s/files/1/0433/0841/7192/files/secret_life_of_pets_free_stream.pdf
    • https://cdn.shopify.com/s/files/1/0430/8952/6951/files/eros_guide_chicago_xxx_stars.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_off00006431.bin
cf2cebe93d4ecdebbee3395645c7a321f9fc50f174efb17967fa5c8876c92453		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6431 5208 bytes
font_01_sfnt_off000075d5.bin
174488f7d2acd813c379980c658d98febb704bfc0d3494ead47dec92517cb4cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D5 10284 bytes

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