Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9840c0c794480e5…

MALICIOUS

PDF

40.4 KB Created: 2020-08-21 20:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5ca50e9cba8eb3bfc8f7cc586c331d1 SHA-1: 822c53f36a8173415c31d87ee706cd770d7be887 SHA-256: b9840c0c794480e5362a380109c479f7b092cc1b24f35a15003a6df774fa07df
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous links, including one to a known malicious redirector at ttraff.com. The document body, though corrupted, appears to be related to HTML to PDF conversion, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious classification.

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/pify?keyword=html+to+pdf+in+php+tutorial
    • http://files.billscottguitar.com/uploads/1/3/1/4/131406629/mivuvimenisikava.pdf
    • http://files.stmaryselmbridge.org/uploads/1/3/2/3/132303102/e262a671a03cdd.pdf
    • http://foremosi.searchlightorganization.com/uploads/1/3/2/8/132814930/dimodu.pdf
    • http://faroziri.eventfinishers.co.uk/uploads/1/3/0/8/130813612/3217356.pdf
    • http://files.monarchbooks.org/uploads/1/3/0/8/130814227/e394125b6e7b178.pdf
    • https://cdn.shopify.com/s/files/1/0431/0115/9575/files/rewoxaxabefugepizodimedit.pdf
    • https://cdn.shopify.com/s/files/1/0435/9058/2427/files/teaching_writing_for_young_learners.pdf
    • https://cdn.shopify.com/s/files/1/0429/7110/3395/files/international_banking_services.pdf
    • https://cdn.shopify.com/s/files/1/0439/7596/6878/files/6529281148.pdf
    • https://cdn.shopify.com/s/files/1/0434/3595/0236/files/nezofajavagi.pdf
    • https://cdn.shopify.com/s/files/1/0441/0825/1288/files/lodinevesotifexokarapote.pdf
    • https://cdn.shopify.com/s/files/1/0432/9321/2827/files/57242443620.pdf
    • https://cdn.shopify.com/s/files/1/0437/8850/1143/files/62671346312.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_off0000602a.bin
d09d4f9cf5addff07126d66830daf81718ef37fc82105d97532dd0fc5b823258		 pdf-font-stream PDF embedded font (sfnt) at offset 0x602A 5064 bytes
font_01_sfnt_off00007133.bin
776841c8398b00449cf39675bd7d54297f3fa5d07b24525093ca7664b3101c8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7133 10404 bytes

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