Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb6ad226d05bac5…

MALICIOUS

PDF

44.8 KB Created: 2020-08-07 15:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6290d1c4e677680f314e5e71a3e0b72e SHA-1: 042d7a6c7daa48af477d5707b0e558ca5e710be0 SHA-256: cdb6ad226d05bac5e34a6d88c8b195732fa329f9a3c512d552679c04cee7ca4d
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.ru'. This URL is presented within the document body, disguised as a link to a Cambridge English proficiency exam PDF. The PDF also contains a mass external link farm, with many links pointing to Shopify domains, likely for SEO manipulation. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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/pify?keyword=cambridge+english+proficiency+2+for+updated+exam+pdf
    • http://files.bingocompany.net/uploads/1/3/1/3/131379612/d2857f2095895b.pdf
    • http://files.sunlightsilverjewelry.com/uploads/1/3/1/4/131453062/d48ca0e8056d.pdf
    • http://files.kimkirch.com/uploads/1/3/0/7/130775827/welobozutudirol-fulunim.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/bawodakigeve.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/guputatumazuxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/86019415672.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6413/files/dc_dc_buck_converter.pdf
    • https://cdn.shopify.com/s/files/1/0440/9229/3272/files/rezuxaru.pdf
    • https://cdn.shopify.com/s/files/1/0435/8127/6319/files/psychosocial_well_being_definition.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9666/files/68962331385.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/68333177186.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/pafalagusuxagafet.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/deductive_reasoning_book.pdf
    • https://cdn.shopify.com/s/files/1/0444/0922/5382/files/fisiopatologia_asma_bronquial.pdf
    • https://cdn.shopify.com/s/files/1/0434/7327/2992/files/54352158768.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/wituketabufibuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5291/files/window_on_scroll.pdf
    • https://cdn.shopify.com/s/files/1/0428/0408/4899/files/5.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/
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/68333

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006beb.bin
9bb006a8029b0fe65450353815077654feeb0670054489b226c82f6afdcef09d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEB 5916 bytes
font_01_sfnt_off00007fe7.bin
b861b2483f44345774fb9be549b7aa12262c191be606b2d78066be4d73ee00e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE7 11744 bytes