Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab37b95f96d0610…

MALICIOUS

PDF

39.6 KB Created: 2020-09-01 18:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01d25080098aef5dead2735eb0dbcf41 SHA-1: 1aa6268e6dbef4f38e54de6f47acc27fce90e8f0 SHA-256: 3ab37b95f96d0610e424c314358751f6ae9d393be6db2f34a4f29b8b45365af5
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.link/pify?keyword=customary+measurement+conversion+worksheet'. This indicates the document's primary purpose is to redirect users to potentially harmful content. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many of which point to 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious.

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.link/pify?keyword=customary+measurement+conversion+worksheet
    • https://static.usrfiles.com/ugd/34ec99_aeb68d2967f74e18a66643d6d3278eb0.pdf
    • https://static.usrfiles.com/ugd/4b68be_a05a293d49d247ccbca50ecceff6f05d.pdf
    • https://static.usrfiles.com/ugd/a4e402_8994330e81d54512a2c0bb61ab117f8d.pdf
    • https://static.usrfiles.com/ugd/b8c837_34572aa648de458f823d9caeefdf3df6.pdf
    • https://static.usrfiles.com/ugd/57c819_303fc8a44bcc414d997ee176d538e255.pdf
    • https://static.usrfiles.com/ugd/b8c837_1669f77a8efc4cfb815a8570660e00f2.pdf
    • https://static.usrfiles.com/ugd/38bf1f_aa979b0561604de18124a5037cb674a2.pdf
    • https://static.usrfiles.com/ugd/b914b5_517cd5606b7342a2b995b4b2aab1c640.pdf
    • https://static.usrfiles.com/ugd/4117a9_fd3ed9d4a94c479d9fb381b9b0a20b54.pdf
    • https://static.usrfiles.com/ugd/a59130_2201ab573c524ce9a39d72ccf15f7caf.pdf
    • https://cdn.shopify.com/s/files/1/0439/1161/0520/files/bukoditaparimamuxifi.pdf
    • https://cdn.shopify.com/s/files/1/0448/5352/6690/files/968157524.pdf
    • https://cdn.shopify.com/s/files/1/0437/9967/5040/files/2762176970.pdf
    • https://cdn.shopify.com/s/files/1/0437/2122/8440/files/addict_with_a_pen_piano.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_off00005e01.bin
943ebe49388408ac6390ed58afec8fc47f9e94abee0e1e280bf192777af776cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E01 5228 bytes
font_01_sfnt_off00006faf.bin
955644fee4942bf8a2d0ade094a9e6e022198a8010e0a0269fb58a619bf00f2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAF 9948 bytes

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