Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6130c67812e97c…

MALICIOUS

PDF

49.6 KB Created: 2020-08-01 03:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80390089f9d34506f405130cf6a55d44 SHA-1: 95f67d965f7c0b78e51a4694d417dd5d276e9665 SHA-256: 8a6130c67812e97cb9e0901312bb47e83502f25445d69ef90c23332ee98dd912
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a link farm heuristic firing. One of the primary links, 'https://ttraff.cc/pify?keyword=ptcb+practice+test+pdf', is identified as a malicious redirector. This suggests the document is designed to lead users to potentially harmful websites under the guise of providing practice tests.

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=ptcb+practice+test+pdf
    • http://files.tigerseyecollective.org/uploads/1/3/1/6/131606046/rojizalopimupolab.pdf
    • http://files.upinsmokemb.com/uploads/1/3/1/4/131483254/2482e47be946391.pdf
    • http://files.roadtomisstexasusa.com/uploads/1/3/0/7/130776498/gusalugoxurozexu.pdf
    • http://files.waynecountysporting.com/uploads/1/3/0/8/130873893/9818260.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/rawati.pdf
    • https://cdn.shopify.com/s/files/1/0433/0291/2158/files/33703210787.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8330/files/navavuzelabuninobomoba.pdf
    • https://cdn.shopify.com/s/files/1/0438/1625/5650/files/papesibalow.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1734/files/uncg_financial_aid_appeal.pdf
    • https://cdn.shopify.com/s/files/1/0429/9312/3491/files/11707890889.pdf
    • https://cdn.shopify.com/s/files/1/0440/6670/1477/files/40044447128.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3636/files/need_for_speed_kickass.pdf
    • https://cdn.shopify.com/s/files/1/0430/1006/4537/files/99751397970.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53567737566.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6015/files/wugotutaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/8324/2401/files/71703128994.pdf
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/cute_writer.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_off000081c1.bin
f76c1e14f9a97c089624160d2f6d4c1de83fb68153eadb1cc360ba7bf8a6abbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C1 5260 bytes
font_01_sfnt_off000093aa.bin
a35a306cad0990ce31e21d1d697e5a8d5a56dd56c3ccef7b3ff4e2c1f84870f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93AA 11064 bytes

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