Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d87f75ed4e881d1…

MALICIOUS

PDF

33.3 KB Created: 2020-08-31 22:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02774c48c2225c019a29442e483b476f SHA-1: 8a007b13b69fafdd28220abc8cf46e53ccf51aa5 SHA-256: 8d87f75ed4e881d1f926576e9cd3a6bb674784762a202b1375fefc7cc2f1f742
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious due to a high number of embedded links, with one specifically pointing to a known malicious redirector. The document body contains obfuscated text and a URL that appears to be part of a link farm designed to lure users to malicious sites. The presence of numerous external links suggests an attempt to redirect users to potentially harmful content.

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=dimensions+guide+browse
    • https://static.usrfiles.com/ugd/b8c837_f601a48014ad4ce6a86afe8b1550cd5c.pdf
    • https://static.usrfiles.com/ugd/05301a_07a05cb854ac4dc085a485ce30691172.pdf
    • https://static.usrfiles.com/ugd/9e14ca_8087c06f5fc6426b988e8cb9581392d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d9209eeff2e4894aded3050dffe764c.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0517/files/15454904956.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/81812937289.pdf
    • https://cdn.shopify.com/s/files/1/0435/9222/0840/files/cancer_immunology_book.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7f35975917b49da92654a75801ee9de.pdf
    • https://static.usrfiles.com/ugd/3de8a6_2eabfe8949274ee392a0c1d87f72ffc1.pdf
    • https://static.usrfiles.com/ugd/b8c837_64db29e16dae4f79b5eeb78c8e0a4e86.pdf
    • https://static.usrfiles.com/ugd/4b874d_4d8c2b3163bb41a1917c27f94f70baed.pdf
    • https://static.usrfiles.com/ugd/b8c837_828c7b6b1e374f26b03c6deba4942538.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_off0000455b.bin
d5b7151af0f2a642b60d99fa73f2fa3cac44b7b9c9b0d72f4f38fedb407e047b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x455B 5132 bytes
font_01_sfnt_off000056ca.bin
89a8454809f8814d4c1a239eaa49db662fdcab5e77216aa90f68abb6a8ebfb2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56CA 9968 bytes

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