Malicious PDF — malware analysis report

Static analysis result for SHA-256 467f260ec2a6e945…

MALICIOUS

PDF

48.2 KB Created: 2020-08-05 02:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3e066fb94d2d779c95741741f6dcca1 SHA-1: 0255fd3a3e1737cfcb34f3f10e1ea26d39d00b83 SHA-256: 467f260ec2a6e945eae35b9bebc3e4fa427165f3fe6fceb83b5a13799def1ef5
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, pointing to 'https://ttraff.ru/pify?keyword=lyphochek+assayed+chemistry+control+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains fragments that suggest a lure related to 'chemistry control pdf'.

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.ru/pify?keyword=lyphochek+assayed+chemistry+control+pdf
    • http://gupajatu.berkeleyfamilypractice.com/uploads/1/3/0/9/130969465/5e9283aa8a.pdf
    • http://files.stalselem.org/uploads/1/3/0/7/130739122/6636163.pdf
    • http://files.btfgcbh.net/uploads/1/3/2/7/132741556/vedirixul.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/gonabizeretusa.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/ic_723_voltage_regulator_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/24661286444.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/zubibigovugonagalowev.pdf
    • https://cdn.shopify.com/s/files/1/0429/7962/3071/files/9652259296.pdf
    • https://cdn.shopify.com/s/files/1/0435/3317/2885/files/rim_shot_gif.pdf
    • https://cdn.shopify.com/s/files/1/0433/6038/7227/files/mubomokevazozaga.pdf
    • https://cdn.shopify.com/s/files/1/0428/7486/3772/files/toruvidazig.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/xejeludaji.pdf
    • https://cdn.shopify.com/s/files/1/0429/3178/1791/files/vuguvijetub.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_off0000706a.bin
960a1b3a1912ebce7256f8dc2d222beb892ddfbe74cace4324a58e9a5d886494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x706A 5504 bytes
font_01_sfnt_off00008307.bin
c2529312ce43ffff704628a56459e70ec15c87ae84a45f4db45843a83bd9bb66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8307 15916 bytes

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