Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef190f8685723bb…

MALICIOUS

PDF

42.5 KB Created: 2020-07-23 23:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a45de07c3ec29feebf6b470dd01d666 SHA-1: a0e84616e74daeb6cc741f660af793b6bd4b3e63 SHA-256: 3ef190f8685723bb3043cd0da180b7c4306c9f37928065ee80aa95559d5ebeba
120 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to academic content ('mit gilbert strang linear algebra pdf'). The presence of a malicious redirector suggests an attempt to lead the user to a compromised or malicious site, likely for phishing or malware distribution.

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/wb?keyword=mit%20gilbert%20strang%20linear%20algebra%20pdf
    • http://files.redtrustbushey.org/uploads/1/3/1/6/131637307/zosakojofutom-gozobosukowemi-joruparod.pdf
    • http://files.richmondyachtclub.ca/uploads/1/3/1/4/131452778/2336249.pdf
    • http://files.myclassicmercedes.com/uploads/1/3/0/7/130775151/mugixeturudo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1454/4808/files/93884158452.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fofigez.pdf
    • https://cdn.shopify.com/s/files/1/0428/9167/3763/files/43128703733.pdf
    • https://cdn.shopify.com/s/files/1/0434/6707/9830/files/gokuzujanotufimabivageno.pdf
    • https://cdn.shopify.com/s/files/1/0436/3727/6825/files/5797156726.pdf
    • https://cdn.shopify.com/s/files/1/0428/9842/3967/files/46037063262.pdf
    • https://cdn.shopify.com/s/files/1/0440/7299/2918/files/tokaguvabamerazutuwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/82230470531.pdf
    • https://cdn.shopify.com/s/files/1/0430/8746/2551/files/mipotinuweletori.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/witatobibob.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/fil

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067f6.bin
40d956205379676aa8ef2f324ee80265638efb6f83fa877c80badfa17260dbef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F6 5032 bytes
font_01_sfnt_off00007918.bin
2fb29eb50ec0de1ce911443f3cd06bb032e86554690dacd1f149efe3614784f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7918 10492 bytes

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