Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3429e2d1770ead…

MALICIOUS

PDF

43.7 KB Created: 2020-08-16 01:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b84c0d47df68d1d269d0c9c5fab96e4a SHA-1: a82aa366430caa744c5d468af61326031ce13154 SHA-256: ac3429e2d1770ead195ca6755c96025d6a122398228278001ac5f2601635a526
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wb?keyword=minoxidil%20topico%20pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=minoxidil%20topico%20pdf
    • http://files.ammonitestudio.co.uk/uploads/1/3/1/3/131384442/36e780b0f66b1.pdf
    • http://files.meadvillefpc.org/uploads/1/3/0/7/130740318/wukubolote-nezeliwegerubos.pdf
    • http://nixipiriw.kihananursery.com/uploads/1/3/1/4/131453416/8317023.pdf
    • https://cdn.shopify.com/s/files/1/0431/9664/5536/files/bula_benicar_anlo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9493/3665/files/mewimozasezukazafot.pdf
    • https://cdn.shopify.com/s/files/1/0439/7803/1262/files/petazesulixagotinude.pdf
    • https://cdn.shopify.com/s/files/1/0429/0304/4263/files/97137534858.pdf
    • https://cdn.shopify.com/s/files/1/0431/7275/7670/files/38067298012.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/naxipumomekomon.pdf
    • https://cdn.shopify.com/s/files/1/0434/1163/6381/files/pcsx2_going_too_fast.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/baloxovevipe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0120/0288/files/array_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3142/files/83152009501.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1563/files/99654272767.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/
    • https://cdn.shopify.com/s/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b6a.bin
d1d6554d1e206092fd9befcb8898b5601b8e1c133f1cbf3c05e9db4f0587e04a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6A 4740 bytes
font_01_sfnt_off00007bb0.bin
45156c9ebd76ce066508e920d3457d5f29408e228011dc199fc64f8eb205e089		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB0 12112 bytes

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