Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd134cfb43e9bc4…

MALICIOUS

PDF

45.2 KB Created: 2020-08-07 08:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5ff22c72580acb2aaa7036896a1ad9d SHA-1: d9888e4be0f5939849e4efd3715980e5ec0cefba SHA-256: dbd134cfb43e9bc465ba58a572fc3d56fa9c6d7d9b1827d585f24d4398c9ad12
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, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning attack designed to funnel users to malicious content. The document body, though heavily obfuscated, contains the target URL and keywords related to psychology PDFs, 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.ru/pify?keyword=7+approaches+to+psychology+pdf
    • http://files.yallabar.com/uploads/1/3/1/6/131637186/tuvaxuji.pdf
    • http://files.9thmediumregimentra.com/uploads/1/3/0/7/130738943/sufiritalibe.pdf
    • http://files.coryblake.org/uploads/1/3/1/8/131871963/769c1a.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/82103146560.pdf
    • https://cdn.shopify.com/s/files/1/0431/6522/1028/files/vukujitoli.pdf
    • https://cdn.shopify.com/s/files/1/0428/4396/3548/files/popusamojojakal.pdf
    • https://cdn.shopify.com/s/files/1/0430/0367/4785/files/85829160003.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/2002/files/lilaxozavepe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/5167203413.pdf
    • https://cdn.shopify.com/s/files/1/0434/4021/0072/files/zimewekasemes.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/33324148025.pdf
    • https://cdn.shopify.com/s/files/1/0440/5487/2214/files/82314151516.pdf
    • https://cdn.shopify.com/s/files/1/0434/5479/1832/files/dfa_passport_application_form_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/vitemufivinafogigekokun.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_off000071b0.bin
61d1765972396b8fada306cc5f27b84ad3d97591cd984ed994b9a0b12edb3638		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B0 5504 bytes
font_01_sfnt_off00008471.bin
6557aa4098fc0c3e4dcce63f44dda31a806378765745fa58430834d7b2404cb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8471 10448 bytes

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