Malicious PDF — malware analysis report

Static analysis result for SHA-256 de75bc47943201fd…

MALICIOUS

PDF

41.5 KB Created: 2020-08-30 12:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9001b35e17154049b578656b9ae016f4 SHA-1: 53febe4c92f9bc797decf7da982037b7e58059a7 SHA-256: de75bc47943201fddc351674153040df82bae66cc378773bd8c8a853276e8648
120 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 'ttraff.com'. The document body, though heavily obfuscated, contains this URL and a reference to a worksheet, suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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.com/wix?keyword=inverse+function+worksheet+rpdp+answ
    • https://cdn.shopify.com/s/files/1/0435/8992/7067/files/boranalunasagumorut.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/22479982647.pdf
    • https://cdn.shopify.com/s/files/1/0430/8818/3456/files/past_simple_exercises_for_kid.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6665/files/70021935945.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/biblia_ortodoxa_en_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0430/8572/5850/files/gate_2020_electrical_question_paper_with_solution.pdf
    • https://cdn.shopify.com/s/files/1/0438/1143/8752/files/97934686658.pdf
    • https://cdn.shopify.com/s/files/1/0438/0069/0845/files/48229020749.pdf
    • https://cdn.shopify.com/s/files/1/0438/6439/1845/files/computer_age_statistical_inference.pdf
    • https://static.usrfiles.com/ugd/b8c837_3747a899bcf04340a272ee1d411db89a.pdf
    • https://static.usrfiles.com/ugd/b8c837_40c8830624294d958afaced067a2b7f0.pdf
    • https://static.usrfiles.com/ugd/5926b4_3805c4a82c9e4a62b4bcf49442cfffd5.pdf
    • https://static.usrfiles.com/ugd/b52961_c3d0ca17fe01420e99ae09999c3c7bb7.pdf
    • https://cdn.shopify.com/s/files/1/0435/8032/6051/files/zizivevumuzebelerapugor.pdf
    • https://cdn.shopify.com/s/files/1/0448/0807/7473/files/pan_card_dob_affidavit_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/lovinoligo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6333/6350/files/mejolixexomona.pdf
    • https://cdn.shopify.com/s/files/1/0429/4760/8730/files/39331104689.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_off000063ad.bin
9a140add28ab2ffc0dce4de7d34ae9d8d1b5ccd9011f7c92b80db24ee4f0ad37
pdf-font-stream PDF embedded font (sfnt) at offset 0x63AD 5364 bytes
font_01_sfnt_off000075f3.bin
b55ac266ff3048ee34eb72b5943592efbcbb2b117e22f19ffe8da9f97f3a3bfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x75F3 10212 bytes