Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c7806bd6822f3f…

MALICIOUS

PDF

39.1 KB Created: 2020-08-16 13:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9daa2d1d7d13824bea65e923d2f23365 SHA-1: 5cf7209509c466942464cf38671c796d73ddabf4 SHA-256: 42c7806bd6822f3f90cb975eb37dd190ab0d47f7afd3cc771d75cce7300327ff
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL https://ttraff.com/pify?keyword=work+visa+application+form+japan, suggesting a lure related to visa applications. The PDF also hosts a link farm pointing to various PDF files, likely for SEO manipulation to increase visibility. The ML classifier 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.com/pify?keyword=work+visa+application+form+japan
    • http://files.vistosopointehoa.org/uploads/1/3/1/3/131380845/1944314.pdf
    • http://files.dermmedclinic.com/uploads/1/3/1/0/131070192/cdd076ef3.pdf
    • http://files.josephdeansdesign.com/uploads/1/3/2/7/132712207/wevime.pdf
    • http://zomudex.millvalley.org/uploads/1/3/0/8/130813604/415ec6a.pdf
    • https://cdn.shopify.com/s/files/1/0433/0681/1560/files/notoparokopegisegidazu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/51630232236.pdf
    • https://cdn.shopify.com/s/files/1/0434/5777/3725/files/fetal_circulation_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/10979520111.pdf
    • https://cdn.shopify.com/s/files/1/0439/2324/3176/files/nevigemokotesosagezuguf.pdf
    • https://cdn.shopify.com/s/files/1/0437/7945/7175/files/buvatiginolusuwawumisa.pdf
    • https://cdn.shopify.com/s/files/1/0430/1606/1091/files/somepopibidalisumupu.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_off00005c99.bin
26f2cad8302591b02d2b2dd0cf6c63ae70011cdd85be4bc08bb8eaffcf5d8f32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C99 5372 bytes
font_01_sfnt_off00006ee4.bin
5459e0382c787c89093eb7e3eb6fdef632ae5480536763842e6dde44f2cb7067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE4 9816 bytes

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