Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8c4e0d5af4bfd1…

MALICIOUS

PDF

36.2 KB Created: 2020-08-03 23:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3348a1975f7c5b25b690a1b6c866d75 SHA-1: 8823862d2d3e5390d72a5b22a64860734e8e3894 SHA-256: 3c8c4e0d5af4bfd12c7c72df22d855f9232d6a005503a028d9cd3e6f141a636d
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is likely the ultimate payload delivery mechanism. The document body text, though heavily obfuscated, contains the string 'Aquaculture research pdf' and the malicious redirector URL, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=aquaculture+research+pdf
    • http://files.treehousewisdomandwellness.com/uploads/1/3/1/6/131637136/7904719.pdf
    • http://files.dutchesstraveldiary.com/uploads/1/3/1/4/131437491/borud.pdf
    • http://files.asasecurityagents.com/uploads/1/3/1/8/131871951/nikimal_xefesiwuzaro_sujukezodujimo_wuwirimazo.pdf
    • http://files.viotein.com/uploads/1/3/1/4/131409090/8703774.pdf
    • https://cdn.shopify.com/s/files/1/0437/8873/0525/files/segopurizeweg.pdf
    • https://cdn.shopify.com/s/files/1/0438/0177/2192/files/extacy_pill_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5271/files/vesimuwudosu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0221/5069/files/factorio_4_to_2_balancer.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/64614490861.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5003/files/minecraft_sky_city.pdf
    • https://cdn.shopify.com/s/files/1/0440/6811/0488/files/wuguzisivuligiwesiwufoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/7509/3159/files/pdf_to_excel_converter_for_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/8605/2504/files/budizixeluvubo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kubogofire.pdf
    • https://cdn.shopify.com/s/files/1/0434/2644/7525/files/28304785022.pdf
    • https://cdn.shopify.com/s/files/1/0433/4285/6344/files/1676795018.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_off00004f8e.bin
7aea241343f92261dfd983e767d7e9d52639fe42324f47328673bf3dd93ff4fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F8E 5360 bytes
font_01_sfnt_off000061c2.bin
56dbe655a4ea31b33200d7735f91c97bdb4e1052310ae130c50e36934dbf1c19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C2 10016 bytes

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