Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d4eb7c1e9bcebe…

MALICIOUS

PDF

47.2 KB Created: 2020-08-17 10:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b46a6e6b0e1d37d1a1dc176c314b35bd SHA-1: fdb6d4efe16f227fd082b6c354aacfb517b24b77 SHA-256: 82d4eb7c1e9bcebe2edaefb3df3edb3af132489e4212dfa978c616ce6e53bddd
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that is also present in the malicious redirector link. This suggests the PDF is designed to trick users into clicking the link, leading them to malicious content.

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/pify?keyword=months+of+the+year+in+french+pdf
    • http://files.ceciliabramhallart.com/uploads/1/3/0/7/130738852/fexusoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/2684/0737/files/rusif.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/66387743582.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/38907248690.pdf
    • https://cdn.shopify.com/s/files/1/0443/0174/6332/files/statistical_inference_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8042/5370/files/481832512.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1866/files/la_campanella_violin.pdf
    • https://cdn.shopify.com/s/files/1/0431/8733/9413/files/50601775498.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5804/files/balop.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_off00007b9b.bin
5f985a8970471cf907e739a58ae0a4000252e92d1c238bcf5aba5cbf51e7d562		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9B 5316 bytes
font_01_sfnt_off00008db9.bin
72e589c4979f9392a10b059dbe23384110121618033ce13bbe21dad191e06939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB9 10184 bytes

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