Malicious PDF — malware analysis report

Static analysis result for SHA-256 9593f76a844e56c1…

MALICIOUS

PDF

33.9 KB Created: 2020-08-31 13:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96b4486af1ca0106d7a57a2898057606 SHA-1: b9d79bc933e7f37a3121d921b249aedb5c5a30dd SHA-256: 9593f76a844e56c11a897dea5454a748d9b046d1853576c933700fc29366c6e0
90 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL which appears to be a lure for educational content. The primary malicious IOC is the redirector URL, which is likely used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 2

  • 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.
  • 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/pify?keyword=handwriting+tracing+sheets+alphabet
    • https://static.usrfiles.com/ugd/b8c837_e31ce52b915e4cf6b3d23d33f2fe7fa4.pdf
    • https://static.usrfiles.com/ugd/b8c837_9010707b508d4fe29e5c843adfd177c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9e3139bcce8430f922dac828fd2f76d.pdf
    • https://static.usrfiles.com/ugd/7f16bd_e44da48b541440c29158962584a9a8e1.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_623d804704a24be29815f498aaeb0f38.pdf
    • https://cdn.shopify.com/s/files/1/0433/7106/9594/files/43137044973.pdf
    • https://cdn.shopify.com/s/files/1/0432/0306/8068/files/lajodewekoxemodenujin.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/fizodosux.pdf
    • https://cdn.shopify.com/s/files/1/0432/2636/6111/files/bsc_nursing_4th_year_syllabus_ruhs.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_off00004654.bin
83df229b13ca72495a272427826c6967b44ab2bb226b7bb734309fe8ccd8175b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4654 5528 bytes
font_01_sfnt_off00005922.bin
caded23f663b878d5c11203b5eeae505e22d83393104c879bf6a8b1a401f83a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5922 9984 bytes

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