Malicious PDF — malware analysis report

Static analysis result for SHA-256 377a8d9bcb1e6944…

MALICIOUS

PDF

38.6 KB Created: 2020-08-28 00:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4aa0b43ed86cfa08797e59d5bbbf3b78 SHA-1: b335dcc6070b8ec4667bbd0becda937a88b561cd SHA-256: 377a8d9bcb1e69446f3f4489c699d9555d61f4e8d48093bc6abd321564831fa6
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is used to obscure the ultimate destination. The document body contains a title that appears to be a lure for clicking the embedded links.

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=subjects+matter+second+edition
    • http://vufud.kmid.com.au/uploads/1/3/1/6/131606156/2150784.pdf
    • http://files.upperlonglakeestates.com/uploads/1/3/1/3/131380485/1589713.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/lokenex.pdf
    • https://cdn.shopify.com/s/files/1/0445/5071/7604/files/amsden_s_celebrated_practice_duets.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/wemapegobidol.pdf
    • https://cdn.shopify.com/s/files/1/0438/3745/6534/files/52272053150.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85755015361.pdf
    • https://cdn.shopify.com/s/files/1/0444/5965/5335/files/most_important_banking_awareness_questions.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6237/files/bubekitefi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5591/4918/files/addiction_on_social_media.pdf
    • https://cdn.shopify.com/s/files/1/0436/0326/3645/files/podakijigewoni.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_off000057b1.bin
83b9e0ed451b98b3626ebdeceec83d36a3415be10541620e9f9044f44fa1d7a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57B1 5372 bytes
font_01_sfnt_off000069d6.bin
630b4a98d4a2e33fcd9d65a8ea1dae9d0190d81a7708018b83a5d6f80296ed7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69D6 10628 bytes

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