Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb57d08385bc4c0…

MALICIOUS

PDF

40.2 KB Created: 2020-08-08 23:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa24823955beb89b4a08345d3cc5fdbc SHA-1: 0adf7d71e18151a7f5dd2e3775925b9e8b2322fb SHA-256: ccb57d08385bc4c05028ede29de388f05c75bfb426c3b6f4b14103ba97e4c3a1
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, https://ttraff.com/pify?keyword=bach+fugue+c+minor+pdf, is designed to redirect users to further malicious content. The document body, though heavily obfuscated, contains this URL and other PDF links, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness.

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=bach+fugue+c+minor+pdf
    • http://mekede.bankscannell.co.uk/uploads/1/3/1/4/131437657/c37e5a8f1fe740a.pdf
    • http://files.bzdickstudio.com/uploads/1/3/0/8/130813975/1672307.pdf
    • http://files.happytailsdaycare.com/uploads/1/3/1/1/131163897/jidigike-jizokali.pdf
    • http://lemewon.ildiamon.com/uploads/1/3/0/7/130738731/4628413.pdf
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/basic_spanish_lessons.pdf
    • https://cdn.shopify.com/s/files/1/0432/2240/1185/files/91708786109.pdf
    • https://cdn.shopify.com/s/files/1/0432/2548/1379/files/advanced_development_economics.pdf
    • https://cdn.shopify.com/s/files/1/0430/7202/8823/files/sanape.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/makalah_agama_hindu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/89431575294.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6602/files/cycle_of_abuse_domestic_violence.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8306/files/87614585837.pdf
    • https://cdn.shopify.com/s/files/1/0436/6788/2134/files/siskiyou_pass_forecast.pdf
    • https://cdn.shopify.com/s/files/1/0430/5564/4823/files/likejofixuvesazirapid.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/74556815719.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_off00005f29.bin
ed19f0d8a98b7a374c837d4b77b5a5b8602e7402e678f5623ac8a3c84f0e808f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F29 5408 bytes
font_01_sfnt_off00007167.bin
0ea8d28688374d02f25a0ce4076511c98b1e069aa6affb6bf9541d4cc9f11f01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7167 10060 bytes

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