Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9a6a502f739c1f…

MALICIOUS

PDF

39.4 KB Created: 2020-08-15 18:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 862c633006db550bc1ca2002c7bebfd5 SHA-1: c869fc3195a8da0e2722cbda9e42d3a30cadbb4c SHA-256: ee9a6a502f739c1f73f88ca7feaddaf38bc6ffa69e8b4c0b1c61bf2c29e5c36d
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.ru/wb?keyword=calculating%20speed%20distance%20and%20time%20worksheet%20with%20answers', is designed to lure users into clicking it by appearing to offer educational content. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many of which are benign Shopify links, but the primary malicious redirector is the key indicator.

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/wb?keyword=calculating%20speed%20distance%20and%20time%20worksheet%20with%20answers
    • http://files.ahhot.com.au/uploads/1/3/0/9/130969546/ed55f136.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1798/files/atoms_elements_molecules_and_compounds_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/8921/3093/files/82334057330.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/juxuzupis.pdf
    • https://cdn.shopify.com/s/files/1/0437/7886/7351/files/31033290382.pdf
    • https://cdn.shopify.com/s/files/1/0433/1477/4169/files/nukobaxamijajijusos.pdf
    • https://cdn.shopify.com/s/files/1/0434/0409/9735/files/balance_sheet_of_toyota_company.pdf
    • https://cdn.shopify.com/s/files/1/0437/7752/3873/files/fisher_paykel_dryer_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/94832839709.pdf
    • https://cdn.shopify.com/s/files/1/0429/7107/0617/files/83180156214.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/nadobevekexofup.pdf
    • https://cdn.shopify.com/s/files/1/0434/9673/4885/files/91352818340.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/51455792016.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9736/files/kfc_printable_coupons_2016.pdf
    • https://cdn.shopify.com/s/files/1/0434/8015/4269/files/35548457054.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_off00005ad7.bin
e65258b42269d81b63bd5213d8b33e00c71f5c9c59d9f1e51734a61d635b8d74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD7 5548 bytes
font_01_sfnt_off00006d97.bin
46e2400897c586fe91da9e53e2ee353e30484c8f73cc1540d319ea997b2fa2dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D97 10192 bytes

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