Malicious PDF — malware analysis report

Static analysis result for SHA-256 849969d49dee31b2…

MALICIOUS

PDF

36.0 KB Created: 2020-08-29 12:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4a6e1986c7c07ca0b9972cf744c637f SHA-1: 8bf54de7f8d7783ecaea8838dbbc362790175f91 SHA-256: 849969d49dee31b2fbb3d295f46efc73328135fdee20a1fa00aeb81dc4cc3ecb
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL, https://ttraff.cc/wix?keyword=have+yourself+a+merry+little+christmas+sheet+music+alto+sax, is embedded within the document body and likely serves as the initial lure. The extensive use of links to static.usrfiles.com suggests an attempt to obscure the final destination or to leverage SEO techniques for distribution.

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.cc/wix?keyword=have+yourself+a+merry+little+christmas+sheet+music+alto+sax
    • https://static.usrfiles.com/ugd/b8c837_3a9e319c0919441899b43172727d5cb5.pdf
    • https://static.usrfiles.com/ugd/fd7405_df891e7f137d479cac3fac3583c9338f.pdf
    • https://static.usrfiles.com/ugd/b8c837_85ce0891ebfe4382ab458826ebf6b0b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_ceefa6617de046cab9af5e0a9b652215.pdf
    • https://static.usrfiles.com/ugd/b8c837_9cf5d56a661243fba9817a90c2b050e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8373fc8801e47aeabcc6c0299ed8792.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb6a9758c2f04997957071f5dc67302f.pdf
    • https://static.usrfiles.com/ugd/60933b_4c141ea7ce2447cb9499977f7d941064.pdf
    • https://static.usrfiles.com/ugd/b8c837_7430fe01572444d5a71cf611f5bbdda0.pdf
    • https://cdn.shopify.com/s/files/1/0432/7086/5052/files/82258946220.pdf
    • https://cdn.shopify.com/s/files/1/0434/0000/3747/files/86710896907.pdf
    • https://cdn.shopify.com/s/files/1/0431/6489/3345/files/nopugubumuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/5411/1656/files/jizuvatamejamezojonig.pdf
    • https://cdn.shopify.com/s/files/1/0437/3286/1079/files/2_letter_country_codes.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_off00004b99.bin
66bf7a0a26886524893ea5e56ab268ca018735bcf1ca29134cb327b59efd0680		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B99 5312 bytes
font_01_sfnt_off00005d94.bin
615a480f5ff0ba79bba0b632178baf1abb20946841016f7f0ed92f83616dce07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D94 10332 bytes

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