Malicious PDF — malware analysis report

Static analysis result for SHA-256 921237cb3dff68e5…

MALICIOUS

PDF

45.1 KB Created: 2020-07-30 08:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5c24c2888addafc24f4dbdbf5b31b94 SHA-1: 1b1e36e02e7d51ec6149f479827e3269f0550503 SHA-256: 921237cb3dff68e5ae98130acd8a7e5ecd38cd96a29b0dd16c6a2af86ac48847
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to 'chassis dynamometer testing'. The ML classifier strongly indicates maliciousness. The primary attack vector is likely a user being tricked into clicking the malicious link within the PDF, leading to further compromise.

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=chassis+dynamometer+testing+pdf
    • http://files.jensnedikerphotography.com/uploads/1/3/0/7/130775174/xebupevuruj.pdf
    • http://files.oldcottonwoodshop.com/uploads/1/3/1/3/131384709/zuxesojusoguvatidem.pdf
    • http://files.earthquakeearlyalert.com/uploads/1/3/1/6/131606408/a0cb8.pdf
    • https://cdn.shopify.com/s/files/1/0434/2530/0629/files/fipapegavebelop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9570/4227/files/jibexigekitinutizilezi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9129/6413/files/debupulaxovuxobok.pdf
    • https://cdn.shopify.com/s/files/1/0435/4703/3752/files/rutiritoxexofaripadububi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/dasebulom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9160/8227/files/3765170628.pdf
    • https://cdn.shopify.com/s/files/1/0432/1837/0728/files/vupemoziparibukuzafonezoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/3547/6636/files/lujulixakezujuseji.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1864/files/loposowuzakofatala.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tefukina.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/ronevunokuperefi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/48565812365.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/files/1

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007260.bin
d5b973a8e6416656f56d058cfa36d3fd3aa51eb6673a3058cb4bc65adfa867d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7260 5336 bytes
font_01_sfnt_off0000845f.bin
7c722538c199341119517fbea0641ac02d3947a3b6bf29c66143510d2ad3f9e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x845F 10216 bytes

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