Malicious PDF — malware analysis report

Static analysis result for SHA-256 769c45e01d44bdf8…

MALICIOUS

PDF

41.7 KB Created: 2020-08-11 19:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41a1346815a75a1437ba2ada422a1e14 SHA-1: 54796eb24b773d9815844994afd4845da92eaed6 SHA-256: 769c45e01d44bdf8f4c2741b2135aa9ef98d75ea2dab3f99c8c84f6a719299d7
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, specifically pointing to 'https://ttraff.cc/pify?keyword=oxford+discover+2+pdf+vk'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. Additionally, a large number of external PDF links were found, suggesting a link farm or SEO poisoning attempt to increase visibility of malicious content. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the redirector's role in the attack chain.

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=oxford+discover+2+pdf+vk
    • http://files.addisontreeremovalmemphis.com/uploads/1/3/1/0/131070178/xovod.pdf
    • http://jusos.yfbf.org/uploads/1/3/0/9/130969724/xonawep.pdf
    • http://files.snackscast.com/uploads/1/3/1/6/131607930/bcbb99.pdf
    • http://nesuto.thesanctuaryatdennypark.org/uploads/1/3/1/4/131452861/fokexasimixakori.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/aprendizaje_basado_en_problemas_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/artificial_intelligence_book_by_deepak_khemani.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1798/files/44491237993.pdf
    • https://cdn.shopify.com/s/files/1/0438/9722/5368/files/97745580163.pdf
    • https://cdn.shopify.com/s/files/1/0429/3722/1276/files/12832611620.pdf
    • https://cdn.shopify.com/s/files/1/0429/8178/5753/files/gunaviwowupos.pdf
    • https://cdn.shopify.com/s/files/1/0434/5593/8725/files/wosazuxopijezogi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/74545078483.pdf
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/cognitive_biases_in_visualizations.pdf
    • https://cdn.shopify.com/s/files/1/0435/1436/4059/files/2896739046.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065a5.bin
c4cc0e15e79ed82452cd6c32b8358666cafb8a863872e2a37888d04e95a42fb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A5 5260 bytes
font_01_sfnt_off000077af.bin
4de25f55a23be16a2396e06bf363cc4cce0b84d707e223bb37bfb5c9721d2e5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77AF 10088 bytes

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