Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec356ba2619e8fa…

MALICIOUS

PDF

45.6 KB Created: 2020-09-04 02:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00ad43bdb2fca277dc037c2044f599e7 SHA-1: ef06437b35edbbacade0cc013b59e09e092b2ac0 SHA-256: cec356ba2619e8fa13c47d0d556db5c68abba512f2490cfc86a2ff51e1ccc20f
150 Risk Score

Malware Insights

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

The PDF file was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a mass external PDF link farm, with the primary malicious URL being 'https://ttraff.cc/pify?keyword=maths+worksheets+for+grade+7+integers'. This suggests the document's primary purpose is to lure users to malicious sites. No scripts were extracted from this sample.

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/pify?keyword=maths+worksheets+for+grade+7+integers
    • https://static.usrfiles.com/ugd/b8c837_3dadca1a3511476bbd9011da8b4af329.pdf
    • https://static.usrfiles.com/ugd/e49726_ed2f01ce4e924221a76ba789beb3e8ee.pdf
    • https://static.usrfiles.com/ugd/6908d7_e65dd55c7e83482caab9a8f0307240d7.pdf
    • https://static.usrfiles.com/ugd/f91cf1_024eae8e5b8e4d4fb8fc7b29aaee92a2.pdf
    • https://cdn.shopify.com/s/files/1/0438/3752/2082/files/antigen_immunology.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8268/files/20140929911.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2412/files/37198528891.pdf
    • https://cdn.shopify.com/s/files/1/0457/5451/5612/files/votobefedivazib.pdf
    • https://cdn.shopify.com/s/files/1/0434/8834/6262/files/xopurobabufedizanewuzujo.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_e694c9a8db094db890c14ccf5c3d9fe6.pdf
    • https://static.usrfiles.com/ugd/f08e01_430cb41543b74c56a9a0b23b88b1731a.pdf
    • https://static.usrfiles.com/ugd/7598fa_ca1abcf7287940749108facf3f22ab46.pdf
    • https://static.usrfiles.com/ugd/54dfea_41535ab20a5c4784b47c4edf0b1e184a.pdf
    • https://static.usrfiles.com/ugd/277b62_b677bed272a04656895ca9895cf5981b.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_off000065bf.bin
c83b0d672d53d5c1df532afe2da339e083d6ebd98e4138f6eb806e682a085415		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BF 5168 bytes
font_01_sfnt_off00007765.bin
de6d7420bbf91be2f202cb9873f4a72917877c6ba947986393228bb1fa93e179		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7765 10468 bytes
font_02_sfnt_off00009b24.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B24 4324 bytes

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