Malicious PDF — malware analysis report

Static analysis result for SHA-256 5637b98e66a47541…

MALICIOUS

PDF

42.0 KB Created: 2020-08-30 07:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89e46525a61965b4dc8e584a45c03571 SHA-1: 8c0de1df7516118e660ab8b95898947ac60e7a5c SHA-256: 5637b98e66a47541976f7ec53b95f7109a2f329123e2d553620a1c566a3f75b5
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=coefficient+fiche+de+paie+metallurgie'. The document body, though heavily obfuscated, contains text related to 'coefficient fiche de paie metallurgie', suggesting a lure related to payroll or financial documents. The presence of many Shopify-hosted PDF links indicates a link farm used to obscure the ultimate destination.

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=coefficient+fiche+de+paie+metallurgie
    • https://cdn.shopify.com/s/files/1/0431/1325/0965/files/vubiwavuvebafonak.pdf
    • https://cdn.shopify.com/s/files/1/0429/8070/4405/files/51345759413.pdf
    • https://cdn.shopify.com/s/files/1/0435/8340/6239/files/certificado_de_origen_ejemplo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3993/9994/files/15956143840.pdf
    • https://cdn.shopify.com/s/files/1/0462/5448/9749/files/81516487186.pdf
    • https://static.usrfiles.com/ugd/b8c837_d51f0409b5254051a863753429337874.pdf
    • https://static.usrfiles.com/ugd/f523c3_ca3cf3ff27cb477690fa662c715a4a13.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_f4d5c68ed514454d9e5908c5104ec6fc.pdf
    • https://cdn.shopify.com/s/files/1/0446/1504/1187/files/10th_class_science_notes_rbse_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/8055/5419/files/94906664299.pdf
    • https://cdn.shopify.com/s/files/1/0463/8644/6491/files/pavugijeni.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8036/files/business_communication_essentials_courtland_bovee_john_thill.pdf
    • https://cdn.shopify.com/s/files/1/0439/2511/0952/files/menoz.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_off000062cb.bin
0723589bbbfc99f3117086f559e65bac062da3d351663047844993f84e5d2cd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62CB 5296 bytes
font_01_sfnt_off0000749d.bin
2fb0effa9f892ed8859abee80b69a977afc95d22e3b1375165b010d30a857d18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x749D 11816 bytes

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