Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c1256548a5ccfd…

MALICIOUS

PDF

43.7 KB Created: 2020-08-31 09:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b019db3b89958b14480cd9c8466ab4ef SHA-1: 154b1f7ad45f37d58fed436fd2b876aa755f4050 SHA-256: f1c1256548a5ccfd473be0f14572c35455edf053dddb74949791edf84191149f
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a PDF link farm. One of these links, 'https://ttraff.ru/wix?keyword=bible++english+standard+version', is flagged as malicious. The document body, though heavily obfuscated, contains references to this URL, suggesting the primary intent is to redirect users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=bible++english+standard+version
    • https://cdn.shopify.com/s/files/1/0433/4803/3689/files/activating_and_deactivating_groups_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2403/files/36293599443.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/raboz.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f6228963cec4c98987791ec670a5623.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/rusadofifexowomafalis.pdf
    • https://cdn.shopify.com/s/files/1/0437/2794/5889/files/programming_ansi_c_balaguruswamy.pdf
    • https://cdn.shopify.com/s/files/1/0439/8697/6926/files/30270030533.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/flowserve_apex_7000_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/32608015754.pdf
    • https://cdn.shopify.com/s/files/1/0468/8769/8589/files/79378716641.pdf
    • https://cdn.shopify.com/s/files/1/0434/0485/3406/files/62571957409.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_off00006bd7.bin
25e2d50d04bef92479f8829181ba1a8e5c7c1ced581f4a0a31e3a7d88f235531		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD7 5336 bytes
font_01_sfnt_off00007df3.bin
506b31469aed1ac49a0585df92715a2f9d09b156ccc60ab3b009d285bf175da3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF3 10604 bytes

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