Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc00240c32f87dc…

MALICIOUS

PDF

145.5 KB Created: 2020-08-21 08:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8ac0631e208062ae21a30a6900f4b98 SHA-1: 29f96b47900ae2cbbcb09914e1535ae91b2c7498 SHA-256: 4cc00240c32f87dc46eb0502e3fa3fe02c2991e2812e4f9345bc40b4a7b022ac
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used to redirect users to malicious sites. One prominent link, 'https://ttraff.ru/pify?keyword=cpr+guidelines+2015+american+heart+association', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to reference 'Cpr guidelines 2015 american heart association', suggesting a lure to trick users into clicking the malicious link. The presence of multiple PDF links and the ML classifier's high confidence further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/pify?keyword=cpr+guidelines+2015+american+heart+association
    • http://files.agefriendlybethel.org/uploads/1/3/2/6/132683005/7703249.pdf
    • http://files.improbable-studios.com/uploads/1/3/1/4/131438571/1301854.pdf
    • http://files.frameglaze.net/uploads/1/3/1/4/131453919/96fe50445f03073.pdf
    • http://files.kyle-a-piat.com/uploads/1/3/1/8/131857465/b6a0e59a.pdf
    • https://cdn.shopify.com/s/files/1/0433/4170/9462/files/64476164254.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/jufag.pdf
    • https://cdn.shopify.com/s/files/1/0433/8407/8503/files/risk_analysis_in_software_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0429/9892/3427/files/87577025048.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9639/files/24060647167.pdf
    • https://cdn.shopify.com/s/files/1/0432/5143/3627/files/fajadorelivudu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1995/9454/files/32526745564.pdf
    • https://cdn.shopify.com/s/files/1/0429/3758/1734/files/zoology_reference_books.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_off0001fba8.bin
8a292c5cf81ee47facb6e7ffe566e3450165e3644f5879ffc3578ba491472ffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBA8 5840 bytes
font_01_sfnt_off00020f62.bin
f892faa3c8ae08314a9fe4b0cd16907f8572b645d89dae325c6b47137f5f4d41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20F62 12256 bytes

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