Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a63cbbc97b0e7f…

MALICIOUS

PDF

34.0 KB Created: 2020-08-31 05:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1538652b579313dafa4bbc46c5f1e46 SHA-1: 46c02b13fec88fe96699e31be385a17cfed89c33 SHA-256: 91a63cbbc97b0e7f3175726c16aee8332fd2201be9400433e839fa30b520c6d4
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=2014+ap+stats+free+response+answers'. This URL is likely used to redirect the user to a malicious site. The document also contains a PDF link farm heuristic, indicating it's designed to host multiple links. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector URL is sufficient evidence for the attack pattern.

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=2014+ap+stats+free+response+answers
    • https://static.usrfiles.com/ugd/b8c837_2ae2582386cf4e27979301d401409196.pdf
    • https://static.usrfiles.com/ugd/3f4b99_6fda914927854d839520debfcf70e58e.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_155fa54090294118959b0eafc1c36501.pdf
    • https://static.usrfiles.com/ugd/c63dba_637f5de498064586ba6f3cbd325f1d60.pdf
    • https://static.usrfiles.com/ugd/93971e_b1c1683d731c4e4a823bd61528f741d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_22b63078c113456380a9961e3a46eb28.pdf
    • https://static.usrfiles.com/ugd/b8c837_932a3e4dac5f4f908cf08eeffd8b4eb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a6bda7af1f449e880e4ca11bba2ed33.pdf
    • https://static.usrfiles.com/ugd/b8c837_84e9cb0a2e9c485fb7883d8ff08fdfe1.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/90386721464.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40169505762.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3929/files/21_day_fix_cardio_workout_cheat_sheet.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_off000046cb.bin
3137d9c0dd80fa1bcac0fe83edeb3bdf9da0bae55bba0cd8beea7493e8550767		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46CB 5272 bytes
font_01_sfnt_off000058d8.bin
6041f43b9c0b2339f13fdc1d765ecb8f3fbc851e86e98354f29018ce10a5c2bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58D8 10152 bytes

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