Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8dfa2596627c70b…

MALICIOUS

PDF

46.4 KB Created: 2020-08-30 21:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b7c47cb623430379b2673b6f905991b SHA-1: a85a4d9dcf2203d3797eafae906b3d5385cc8363 SHA-256: f8dfa2596627c70b103d0922b6fe377d549a0991492297ed104c3fcc2eec51c7
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/wix?keyword=vince+gironda+back+exercises', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain references to the linked content and the PDF generation tool, suggesting a lure to entice users to click the malicious link. The primary attack pattern involves redirecting users to malicious sites.

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=vince+gironda+back+exercises
    • https://static.usrfiles.com/ugd/77941b_a76655cedd2b4126919025d7df9d7f51.pdf
    • https://static.usrfiles.com/ugd/88a84f_c561d61219fa4d5eac23d2d3a17440c7.pdf
    • https://static.usrfiles.com/ugd/d775a9_a1b1682765484fa8803eef198de2721a.pdf
    • https://static.usrfiles.com/ugd/b8c837_32f6563762d24f5e9b8764a9afd3a3ee.pdf
    • https://cdn.shopify.com/s/files/1/0430/7137/3466/files/hover_dynamic_dns.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/zovepagitofejulu.pdf
    • https://static.usrfiles.com/ugd/238140_00c04b3f3230439292089ffcb26ca013.pdf
    • https://static.usrfiles.com/ugd/b8c837_b045058898184f6b8774cabba4cb35ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_06726444992e4d47ac4fef5d33b314e5.pdf
    • https://cdn.shopify.com/s/files/1/0429/6150/2362/files/pogeribubudev.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/tuxivukulejemuja.pdf
    • https://cdn.shopify.com/s/files/1/0436/1230/7618/files/biwemozepizosodumikabeful.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99594865370.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_off000077b4.bin
1cc68c7d14f121ef7bcd1f4e40e8ff1df9db76405b308edd35ce064bfd9a82ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B4 5312 bytes
font_01_sfnt_off000089cc.bin
3e7899b039e5a3bdf41b629c8d8e303983d18f73b7cb3f55c6a5bce6bf039194		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89CC 10388 bytes

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