Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21a83cd71f766e2…

MALICIOUS

PDF

39.9 KB Created: 2020-08-22 19:39:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f84f9421071b14dd4c56e34cee7f0a7 SHA-1: 551889242e779b8354bb51a4a2ce74f1a426338c SHA-256: c21a83cd71f766e247f52226d636617ad1c6066cb219e8ddbcf3c4643191ff31
120 Risk Score

Malware Insights

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

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 for the redirector, suggesting a social engineering lure related to 'corporate manslaughter sentencing guidelines'. The presence of numerous Shopify-hosted PDF links indicates a link farm strategy, likely to obscure the malicious redirector or to improve SEO for malicious content.

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=corporate+manslaughter+sentencing+guidelines
    • http://files.grandlakeusps.com/uploads/1/3/1/4/131409717/3338863.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65587220918.pdf
    • https://cdn.shopify.com/s/files/1/0430/1606/1091/files/42292283317.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6808/files/60293844409.pdf
    • https://cdn.shopify.com/s/files/1/0434/6478/6086/files/pamoserusetosewuxozekuzi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9336/0801/files/kebusitepi.pdf
    • https://cdn.shopify.com/s/files/1/0440/0336/0926/files/40416069555.pdf
    • https://cdn.shopify.com/s/files/1/0429/1067/9206/files/2348754029.pdf
    • https://cdn.shopify.com/s/files/1/0432/8914/9608/files/roferepisaxufuzinawipi.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_off00005fff.bin
3273021b7448a6a70fdd113b6dddb77e0e0a769d5909694e138ce3b867458af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFF 5392 bytes
font_01_sfnt_off00007216.bin
94dc9fb3c47e5dfa24ef4809c21178d3dc0c2e00422c16bb2aa22c27773ed0f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7216 9720 bytes

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