Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4c46d89d7313ad…

MALICIOUS

PDF

35.5 KB Created: 2020-08-30 19:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b27c3c7736eea79f8133c307c20d823b SHA-1: add6d666045bc67c42ec2e48b5b1bee6597489b2 SHA-256: 8f4c46d89d7313adbe1dc5e583e7eca606db2dcb892b0365bc6324f23f28172e
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=emmanuelle+hisli+duygular+t%25C3%25BCrk%25C3%25A7e+dub'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, one of which is 'https://static.usrfiles.com/ugd/b8c837_8c7fedc56ae14cd1a0b5a23f58cdc1f3.pdf'. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of these malicious links indicates a likely phishing or malware delivery attempt.

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=emmanuelle+hisli+duygular+t%25C3%25BCrk%25C3%25A7e+dub
    • https://static.usrfiles.com/ugd/b8c837_8c7fedc56ae14cd1a0b5a23f58cdc1f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d3ec3c1ad434ad798a0a73c8f47de11.pdf
    • https://static.usrfiles.com/ugd/f46427_0d19f41075da41989511eeaf318ef9be.pdf
    • https://static.usrfiles.com/ugd/9f6a24_356ada9ae58c4eca97020be796120331.pdf
    • https://cdn.shopify.com/s/files/1/0445/8404/2655/files/motor_failure_root_cause_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0431/5942/1092/files/68103556583.pdf
    • https://static.usrfiles.com/ugd/136d07_f77a4c7ebb244b29a51e0e940a3f8df9.pdf
    • https://static.usrfiles.com/ugd/e3ff21_eb14b1a1bdbe4dbcb29489bfe904cc25.pdf
    • https://static.usrfiles.com/ugd/26938b_504e5236c42744658b62340fe3ecaa53.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ebee40831c845dfab009c960da293fe.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/48273576111.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5906/files/97205234846.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/vajefelebupedodovun.pdf
    • https://cdn.shopify.com/s/files/1/0437/4295/3626/files/13947924488.pdf
    • https://cdn.shopify.com/s/files/1/0429/6402/5493/files/95359731086.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_off00004b39.bin
5ebb61e84709ed58800c19b261acb334ba97f46834de3458af32fc0f82be85a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B39 5804 bytes
font_01_sfnt_off00005e96.bin
ae3d230b03b9be0bf1d6a0aaba539762b817d1c6e611507851cba4d522a8ca1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E96 10468 bytes

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