Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7ee525fd1cfab7…

MALICIOUS

PDF

47.5 KB Created: 2020-08-31 03:40:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b18208464ddb8c71964ce4c98f2488fa SHA-1: 7b9607bf2f468b3f3d1bdfd55ab36d5b989ee62d SHA-256: cf7ee525fd1cfab758161270d91ee9998fb6dbc4f417f50e0c70106594a83f80
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, pointing to 'https://ttraff.ru/wix?keyword=tri%25E1%25BA%25BFt+h%25E1%25BB%258Dc+l%25C3%25A0+g%25C3%25AC'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to a malicious site via the embedded link.

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/wix?keyword=tri%25E1%25BA%25BFt+h%25E1%25BB%258Dc+l%25C3%25A0+g%25C3%25AC
    • https://cdn.shopify.com/s/files/1/0434/0128/1703/files/80906677590.pdf
    • https://cdn.shopify.com/s/files/1/0430/5187/6509/files/41397392617.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3530/files/66802305403.pdf
    • https://cdn.shopify.com/s/files/1/0432/3953/8851/files/11835511955.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/83014739499.pdf
    • https://static.usrfiles.com/ugd/b8c837_05c48aadc00045f3a10cb15d4f2c7443.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b90efcf3d364fdf8a2a72e895831b98.pdf
    • https://static.usrfiles.com/ugd/a771bd_b17f4aa6122a4939b35d9cc4d175dfca.pdf
    • https://static.usrfiles.com/ugd/dc98cc_8d0a253d1ac644709f090bd03a614462.pdf
    • https://static.usrfiles.com/ugd/fe83c3_463c252688bb44ac84be8da80631add9.pdf
    • https://cdn.shopify.com/s/files/1/0438/7520/5288/files/23247458297.pdf
    • https://cdn.shopify.com/s/files/1/0463/1262/0192/files/96407382598.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/72363655024.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_off00006df9.bin
fca44cd39b97c7fb333b276d0883d5a8beee8362c26d90b5697947d76c48025d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF9 5204 bytes
font_01_sfnt_off00007f28.bin
737473c3bb3cab96a47457443d6431ec086c29c857eb5473a91af9bf065515ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F28 22980 bytes

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