Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe2acdb1b6a04b4…

MALICIOUS

PDF

50.6 KB Created: 2020-07-24 13:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ffc5d8c30485658d6c9a01df7ae0b5a SHA-1: 7a0afc673564a8c6e0e8555ebf77ea4c876abd04 SHA-256: 4fe2acdb1b6a04b4e418e3571b4dff1fe11505cd0460332ffda63069126cb6cf
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 Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to 'high school informative speech topics', likely a lure to encourage users to click the embedded links.

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=high+school+informative+speech+topics
    • http://files.prigitalsolutions.com/uploads/1/3/1/0/131071076/577897.pdf
    • http://files.wyonghighcareers.com/uploads/1/3/1/0/131070579/94bd3d5850ed24.pdf
    • http://files.arubathewedding.com/uploads/1/3/2/3/132303126/216469.pdf
    • http://files.hangarmom.com/uploads/1/3/1/3/131382092/7958681.pdf
    • http://files.prigitalsolutions.com/
    • https://cdn.shopify.com/s/files/1/0432/0568/9504/files/bovidapabalekadew.pdf
    • https://cdn.shopify.com/s/files/1/0440/8662/4406/files/59163239426.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/vubuvul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/japoxotoruzub.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/72112314087.pdf
    • https://cdn.shopify.com/s/files/1/0430/4424/1562/files/suviraripeforufenu.pdf
    • https://cdn.shopify.com/s/files/1/0438/8651/0232/files/mebuziteg.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7776/files/60535912922.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3670/files/difokifusefolonufogeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/3947/3314/files/16722802792.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/13391805233.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077fd.bin
611f3db65d644b1c54ca9459fd1b922419f4f90529f892feeb7d4571f542e8e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77FD 6568 bytes
font_01_sfnt_off0000884c.bin
6a7a7ec77bb68f0cdf5e39c8ba30d74064ea921044e703cd2955ca4641d8304a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x884C 5236 bytes
font_02_sfnt_off000099ec.bin
8ea55fd590ff0eb9fbc0cc69019d3fd9a16771cd62bc320a93b553b8dca1aca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99EC 10208 bytes

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