Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff74bcf3641e7d7e…

MALICIOUS

PDF

41.9 KB Created: 2020-08-04 22:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a8922400ca422209a4e2d6c70690937 SHA-1: 3b7068665c4c8cc2d9b86a926b92128cf6f6dc10 SHA-256: ff74bcf3641e7d7e306aa7ecaa138b08e81a8bba35c96783f0b046a37a6d8daa
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a known malicious redirector. The heuristic firings indicate this is likely part of a link farm designed to manipulate search engine results or redirect users to malicious content. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web 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.ru/pify?keyword=staphylococcus+aureus+infection+treatment+pdf
    • http://files.artlynchactingcoach.com/uploads/1/3/1/3/131380868/tagaxe.pdf
    • http://files.lprincedesignsartjewelry.com/uploads/1/3/1/8/131872298/3919018.pdf
    • http://files.risingstartoyfoxterriers.com/uploads/1/3/1/4/131453036/mutatifora.pdf
    • http://files.candsplastics.com/uploads/1/3/0/8/130874217/xidojabizum.pdf
    • https://cdn.shopify.com/s/files/1/0438/0885/0081/files/geografia_e_meio_ambiente.pdf
    • https://cdn.shopify.com/s/files/1/0432/1673/2320/files/37002527651.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5634/files/votepidoraxigozolesunasez.pdf
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/wugosobo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6952/8471/files/puzikupajewidekipofimi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/associated_press_stylebook.pdf
    • https://cdn.shopify.com/s/files/1/0432/1912/4382/files/28211790483.pdf
    • https://cdn.shopify.com/s/files/1/0432/3485/3021/files/the_four_cardinal_virtues_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/50919446332.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mefawubizujoki.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/30191491682.pdf
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/7114669344.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76957488457.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_off000060ec.bin
69b8e78abb229557c7e2ebdbf0cf95468b70aa3fabdd03bacc2fa51281c47783		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60EC 5600 bytes
font_01_sfnt_off000073d4.bin
e0cb67c8a9d24a1855152b26c5667ebec49a06af0759f70185a01a664a1dfcd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D4 12080 bytes

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