Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f0fd44949c220a…

MALICIOUS

PDF

62.3 KB Created: 2020-08-31 16:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa27908e2a1c00f93eea64d48c51eadd SHA-1: 716afe193ae5baa423fa7ed099069162fb44f8dd SHA-256: e1f0fd44949c220af0f29c92445519fc7effa9f6c21ee0b0e71454567bef81fe
150 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic firing indicating a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=cluster+computing+architecture+pdf'. This URL is likely used to direct users to malicious content. The PDF also exhibits characteristics of a link farm, with many links pointing to external PDFs, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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/wix?keyword=cluster+computing+architecture+pdf
    • https://static.usrfiles.com/ugd/b8c837_9e555a8fb9454e799ab6494884fca9d0.pdf
    • https://static.usrfiles.com/ugd/badafb_003ffc75fad54ba990c10ccd0f2c1a06.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_734a751579de4effa6be7ffc39b29562.pdf
    • https://static.usrfiles.com/ugd/c618e9_99603a0ff04d41b3945484cecdea450e.pdf
    • https://static.usrfiles.com/ugd/b65acf_637e616b1b9c46f9999759b49a53c0aa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4288/2215/files/96265091805.pdf
    • https://cdn.shopify.com/s/files/1/0436/7292/8409/files/82951213528.pdf
    • https://static.usrfiles.com/ugd/bf650e_25e542918c6a47e396772fbe98a191f3.pdf
    • https://static.usrfiles.com/ugd/067ecb_6aab2b21fc3044aaaf09832024d92819.pdf
    • https://static.usrfiles.com/ugd/158fb9_8777fc51959b4991b21a339ec446ef67.pdf
    • https://static.usrfiles.com/ugd/934fc3_c0b9ec230cb74d668c06bc62c11cbb17.pdf
    • https://static.usrfiles.com/ugd/b8c837_4641cd3f38434792bf12e4f0fd3a7cff.pdf
    • https://static.usrfiles.com/ugd/b8c837_1669f77a8efc4cfb815a8570660e00f2.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_off0000982a.bin
0f8936eb2c13e062d64c244f1190fdef6d8595905d5b0edc7e5bdcaf56609a83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x982A 5476 bytes
font_01_sfnt_off0000aa9b.bin
d6781f04ce124bd0929a988a78f8fe2641d15a615618f3a5f27be969309bb011		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA9B 12372 bytes
font_02_sfnt_off0000d28d.bin
804a63ab77382d8d296731af4743821198244161ec3d537468d839519a3607da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD28D 17272 bytes

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