Malicious PDF — malware analysis report

Static analysis result for SHA-256 5806a64886459354…

MALICIOUS

PDF

37.5 KB Created: 2020-08-22 04:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b9e4b301b569bdec4d9a0fadd52d552 SHA-1: 620fb7b089d44626b27d094d5f82020dbd0bc440 SHA-256: 5806a6488645935401156517af3425442ba9595adb7672af26c92a051f19dddf
150 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 other PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is further disguised with a keyword related to educational worksheets. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the primary attack vector appears to be the redirection to malicious infrastructure via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.cc/pify?keyword=articles+worksheet+for+grade+3+pdf
    • http://tezux.heritageelementarypto.org/uploads/1/3/0/8/130874431/6496406.pdf
    • https://cdn.shopify.com/s/files/1/0432/5533/3027/files/nimuril.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/kigagorum.pdf
    • https://cdn.shopify.com/s/files/1/0431/9336/8725/files/73158034445.pdf
    • https://cdn.shopify.com/s/files/1/0434/9417/8982/files/99666483145.pdf
    • https://cdn.shopify.com/s/files/1/0432/8190/7870/files/79572213869.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/kupanafotuvozixuramizin.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0728/files/banevibasij.pdf
    • https://cdn.shopify.com/s/files/1/0436/1384/7710/files/broiler_farm_house_design.pdf
    • https://cdn.shopify.com/s/files/1/0431/7010/3452/files/53049728035.pdf
    • https://cdn.shopify.com/s/files/1/0432/3934/2248/files/exemplaire_certificat_de_travail.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_off000053ab.bin
187e49dab1da362e7a60ea7e095a009369851dc6f8b6d42d4a83c25c8a525fee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53AB 5724 bytes
font_01_sfnt_off00006737.bin
91ff907568ba489cbad2d8fc2ea82128d0a1edecaf2f980cada831532cc8aca2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6737 10072 bytes

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