Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9f85456cc276ef…

MALICIOUS

PDF

40.8 KB Created: 2020-08-31 02:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b755bf7d7d5a34f7bbe4ae17eef29332 SHA-1: 896d767a9170c42608903ac8294ea9df9a1aec62 SHA-256: 9d9f85456cc276ef0675c1adec72054c9fbb9a1aa9a0d0bb180e383b5e805013
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=capital+adequacy+ratio+under+basel+3'. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous links to external PDFs, including 'https://static.usrfiles.com/ugd/8b49c6_0a44470d1eb343439c070cbad438bf56.pdf'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of these links suggests a phishing or redirection 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=capital+adequacy+ratio+under+basel+3
    • https://static.usrfiles.com/ugd/8b49c6_0a44470d1eb343439c070cbad438bf56.pdf
    • https://static.usrfiles.com/ugd/6f53d7_39319a44dc084c498e61b8065f977151.pdf
    • https://static.usrfiles.com/ugd/bfbc46_acdc98684a374683923aa0e9e9b2fe61.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8177ee939264312bc87960bd83c0ff5.pdf
    • https://static.usrfiles.com/ugd/79e0dc_14165a1e85a34513b4bd315595b9e245.pdf
    • https://static.usrfiles.com/ugd/1f5cef_0d41a573eae643c89cde17e7eefdcae4.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_ec8d8a79b2f943c9be66deadbd9ab929.pdf
    • https://static.usrfiles.com/ugd/b8c837_434ccc9b8f9e4b3ba382b2214af7b011.pdf
    • https://static.usrfiles.com/ugd/9ea91e_c83a5f4ec037461182d6f30bbfecd345.pdf
    • https://static.usrfiles.com/ugd/b8c837_feea9c8c46c14084a1ed97d141a35646.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/39030236240.pdf
    • https://cdn.shopify.com/s/files/1/0431/1921/4756/files/zivisidelazobidofugasagos.pdf
    • https://cdn.shopify.com/s/files/1/0431/1272/6677/files/dynamics_of_machinery_question_bank_with_answer_regulation_2020.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_off00006009.bin
8f3c137471c275beefda28ad5971ea566535bae0d83b7bfcd1ad96a69b909478		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6009 5504 bytes
font_01_sfnt_off000072c8.bin
b7291900aa6873424f69ce0c996ed4ee69ee77b2944260c8aeb2c0d4f0b6f049		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C8 10496 bytes

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