Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c12c9bf70d8f8e…

MALICIOUS

PDF

47.4 KB Created: 2020-08-30 01:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3684d90c56887281ecc81931ad59f06 SHA-1: 0168f66cd4fc67bd64a1ab86e8a9973432ba4b7a SHA-256: f9c12c9bf70d8f8e2fe296ef7a8c51f97dde18feca74832415257377c9197646
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a redirector, which is likely the primary mechanism for delivering a malicious payload or leading users to a phishing site. The presence of numerous embedded links, many pointing to shopify and static.usrfiles.com, suggests a link farm designed to obscure the ultimate destination.

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.com/wix?keyword=be+used+to+get+used+to+exercises+pdf
    • https://cdn.shopify.com/s/files/1/0435/0902/2886/files/wimibupab.pdf
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/64895711421.pdf
    • https://cdn.shopify.com/s/files/1/0434/8621/6344/files/93036789552.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9759/files/64085316824.pdf
    • https://static.usrfiles.com/ugd/69b86f_69f04f2313634db6acb3db25b45ec0d0.pdf
    • https://static.usrfiles.com/ugd/36f25b_6d1b22a8ab7544b5aac30b4c36f12984.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffa8688089a64fd181585a1459adc7e0.pdf
    • https://static.usrfiles.com/ugd/82e28d_4bf17ea23c5d4e9193bbec21e6d89d6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_f44beb747a9245f6bf874a2b572fcb98.pdf
    • https://static.usrfiles.com/ugd/4b874d_65fd9a04b7e9410e8b5bf0f30fb488b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_e41261e3f39d47ac8a0695c7094588b7.pdf
    • https://static.usrfiles.com/ugd/b7ed05_f723e253ab5e4ed0981fccb4cc23661a.pdf
    • https://static.usrfiles.com/ugd/67e251_e8a24665e2034808affa9de6f2ba2bc4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f13.bin
474cffabdc1c91401c7b727a6559003dc450d87b54e4399e3e1d4b7e3100c274		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F13 4976 bytes
font_01_sfnt_off00008025.bin
4e3247a8291ba67d51043ab6c954421a13fe1b02eecfa8c257b19060f6c182f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8025 10296 bytes
font_02_sfnt_off0000a2e0.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2E0 4324 bytes

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