Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ba79a8ee2c601d…

MALICIOUS

PDF

49.4 KB Created: 2020-08-29 21:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02d99842bcafd71d175c7e2ae10887ef SHA-1: 795b98dc97c6c033368d3278b05ebcea1783e42e SHA-256: f9ba79a8ee2c601d7fd6bbdbc42a753fc640bf846e37031aa4ef5806ce6e3b11
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The embedded URL points to a redirector service, and the document body, though heavily obfuscated, contains a reference to the same URL. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to malicious sites via embedded links.

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/wix?keyword=nudos+de+pesca+faciles
    • https://cdn.shopify.com/s/files/1/0430/8015/5290/files/pexebaveselivezo.pdf
    • https://cdn.shopify.com/s/files/1/0439/9667/6254/files/pedep.pdf
    • https://cdn.shopify.com/s/files/1/0431/4831/2736/files/difference_between_archaebacteria_and_eubacteria.pdf
    • https://cdn.shopify.com/s/files/1/0440/5772/3030/files/ccna_exam_questions_200_125.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7603f3b730b4ec0a5627ef94f09ea5f.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd3d900482cb45d59024eacf05b8b21b.pdf
    • https://static.usrfiles.com/ugd/409ca8_fd98a2b813e0477eb9ed497957694a7a.pdf
    • https://static.usrfiles.com/ugd/79e0dc_154988bfa87441799e116a5691298220.pdf
    • https://static.usrfiles.com/ugd/b8c837_351a181d98fa4a3eb7301eebd9f2f107.pdf
    • https://cdn.shopify.com/s/files/1/0434/9542/4165/files/cpa_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/1219/2413/files/kaxugadedo.pdf
    • https://cdn.shopify.com/s/files/1/0463/4981/1869/files/6080676878.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/active_directory_domain_services_basics.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd2ae9ae8ce14bfdb84d20c21b217453.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb6e98e35c1c412cabe37c7b2cbcebe8.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/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081b6.bin
33d2951a9eb2925763ebefbff9278212cabc72e80b78261de578721b482d205c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B6 5020 bytes
font_01_sfnt_off000092e1.bin
6b1c0bfd671fb6f559dda4616f018e72d9bf96b98b25467e03488079835cd0eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92E1 11128 bytes

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