Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff6f16ec64bb3f5…

MALICIOUS

PDF

40.8 KB Created: 2020-09-02 05:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 979d9c1b0fdf6f8db3f26a98be74b64d SHA-1: 47e762fa86cfa5fd4015635de615549a8730f381 SHA-256: dff6f16ec64bb3f509ace65f8f95ac530abe5198fa66af9d1e8224917af2335f
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, pointing to 'https://ttraff.club/wix?keyword=hyperbola+worksheet+answers'. This URL is presented within the document body, disguised as a link to worksheet answers. The PDF also contains a large number of external links, many of which are benign Shopify URLs, suggesting a link farm or SEO manipulation tactic. 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.club/wix?keyword=hyperbola+worksheet+answers
    • https://cdn.shopify.com/s/files/1/0431/0958/0961/files/official_chess_score_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/english_grammar_worksheets_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0429/5078/7231/files/28353689845.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/5556985234.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3330/files/binibototal.pdf
    • https://static.usrfiles.com/ugd/599026_b67dc502339542bb9037ae46abb1eb08.pdf
    • https://static.usrfiles.com/ugd/ac0094_9e4e35538d934e22bf6aac07022b660e.pdf
    • https://static.usrfiles.com/ugd/9ea91e_9958c40947f44456b5b622d7a3faaa6f.pdf
    • https://static.usrfiles.com/ugd/eb4c03_057f8c4f297d427aa24aafcf9f3db928.pdf
    • https://static.usrfiles.com/ugd/2ac701_cd1590b93cd64e3b9229c0a8f782a433.pdf
    • https://cdn.shopify.com/s/files/1/0431/0928/6050/files/carson_dellosa_printables.pdf
    • https://cdn.shopify.com/s/files/1/0429/9676/0730/files/agammaglobulinemia_bruton.pdf
    • https://cdn.shopify.com/s/files/1/0430/1773/2249/files/better_than_carrots_and_sticks.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4716/files/88368275920.pdf
    • https://static.usrfiles.com/ugd/8b49c6_23f9e28dedbe48339fd241b9c9c4be58.pdf
    • https://static.usrfiles.com/ugd/b8c837_313abcab9aa74276abf6d0758529c226.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_off000061c4.bin
d52f750ecc0e62b8e0b8956456b0e0c60b8c8a2e7e92574f0316ff9e2f5eafde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C4 5268 bytes
font_01_sfnt_off000073b3.bin
657af08f385ab0ae697df95052f7ad40fbf45cbcac8153af591f614b5f009a7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B3 10204 bytes

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