Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe815be7adce7339…

MALICIOUS

PDF

38.7 KB Created: 2020-08-24 18:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b31351a30765fd970e1cef675ee58d5 SHA-1: 44424359616f1ecd6a02fcef4a38eb57c478892d SHA-256: fe815be7adce7339bcf2b7a8fbad11a1664d34ea035613c8c82a8ce89122b77a
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com' with a deceptive keyword. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link within the document.

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=cash+flow+statement+class+12+format
    • http://files.zegermanmarkt.com/uploads/1/3/1/1/131164295/nubutelorewazenuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/7119/2732/files/grudem_systematic_theology_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7711/files/11555720747.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/google_docs_newsletter_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/6488/5397/files/33078361186.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6940/files/kevufebijola.pdf
    • https://cdn.shopify.com/s/files/1/0432/4143/9400/files/53969413992.pdf
    • https://cdn.shopify.com/s/files/1/0437/1267/5990/files/nawasuse.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/dajejopuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/5561/2058/files/jinukinimukajefalafeka.pdf
    • https://cdn.shopify.com/s/files/1/0431/9258/2293/files/66332560660.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_off00005b4d.bin
4a0d5acd6b7e1ea40f3cba8dd3f18c9beff43bed3c2418b30fdc2125af47e617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B4D 5304 bytes
font_01_sfnt_off00006d49.bin
78a5ee357882dce59b9cc428c9a504597bcc6df779c694367e94768049b4d4ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D49 9716 bytes

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