Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb21f46da573d737…

MALICIOUS

PDF

38.2 KB Created: 2020-09-01 10:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93f986a10a8553f91bcf13edf0c1b9b6 SHA-1: 7864f6caec10666bec21e999cc74740244511828 SHA-256: cb21f46da573d7378d217fc0ba6c55c81f6fe24c17c888c8812685d0deea1fb5
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=excel+vba+deselect+sheet'. This URL is presented within the document body, suggesting a lure to trick users into clicking it. The presence of a large number of external PDF links, many hosted on CDNs, further indicates a link farm or SEO poisoning attempt to drive traffic to malicious infrastructure. The file itself is generated by wkhtmltopdf, a tool often used to create PDFs from web content, which aligns with the observed link farm behavior.

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.ru/wix?keyword=excel+vba+deselect+sheet
    • https://static.usrfiles.com/ugd/b8c837_2150e9f0dea54ed888cc0ed45ba302a3.pdf
    • https://static.usrfiles.com/ugd/270e53_5d9228eb871a4502824cbdb62da2fdef.pdf
    • https://static.usrfiles.com/ugd/2c608b_598b1b5c50ec4d53a8a4166a2b6fe064.pdf
    • https://cdn.shopify.com/s/files/1/0427/4873/9740/files/349081166.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0066/files/lejutop.pdf
    • https://cdn.shopify.com/s/files/1/0435/8982/8771/files/definition_of_problem_solving_in_mathematics.pdf
    • https://cdn.shopify.com/s/files/1/0431/8914/1664/files/teoremas_y_postulados_del_algebra_booleana.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/9588379393.pdf
    • https://cdn.shopify.com/s/files/1/0440/4586/1029/files/brookfield_house_school_uniform.pdf
    • https://cdn.shopify.com/s/files/1/0431/7446/1589/files/48736225317.pdf
    • https://cdn.shopify.com/s/files/1/0440/4586/1014/files/kolenupojigalujisunewuxi.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_off000057f8.bin
62e4e7c1ebaf3767fc399384d56e67e165fe64eee4463d0d21bc4f66e062e7bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57F8 5156 bytes
font_01_sfnt_off00006986.bin
01325476a8d26137169176badd598dd34363d68450ecf2a7e0288385fcd7025d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6986 10200 bytes

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