Malicious PDF — malware analysis report

Static analysis result for SHA-256 eee91e9d740d7b25…

MALICIOUS

PDF

41.2 KB Created: 2020-11-01 05:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d10dd1913ec69fc13c59453b37712cd SHA-1: 1459e2c17c0f7976f40de7acfb390485c89f997b SHA-256: eee91e9d740d7b252d715d5cfb203effacaf527d9075b2d14416d4f09012dbd2
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly flagged this PDF as malicious. The embedded URL points to a redirector service, indicating an attempt to obscure the final malicious destination and likely deliver a phishing page or malware.

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/123?keyword=introduction+to+python+pdf+2019
    • https://latijazaw.weebly.com/uploads/1/3/4/3/134312978/vidomalo.pdf
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/1582369.pdf
    • https://cdn-cms.f-static.net/uploads/4376625/normal_5f9033674fa54.pdf
    • https://cdn-cms.f-static.net/uploads/4420224/normal_5f9e0b2bee9fc.pdf
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5f96cdb515670.pdf
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/4117067.pdf
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f88644950a8c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zunaduxa/aura_libro_carlos_fuentes.pdf
    • https://cdn.shopify.com/s/files/1/0504/7196/0771/files/94864936352.pdf
    • https://s3.amazonaws.com/kavitokolezub/critical_care_nursing_made_incredibly_easy_free_download.pdf
    • https://s3.amazonaws.com/kiwopusafize/clinical_pathology_and_haematology.pdf
    • https://s3.amazonaws.com/remuv/pevotikuzimuwedifeg.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006234.bin
cefca4c3e2b5fd0651c6aa35e194121dd6e4a36e9e3d588b593f129699b36445		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6234 5344 bytes
font_01_sfnt_off00007475.bin
bbab6e392b4b032a94cf9321137e29703b31b2f7fd5ba54428c91bacb6832de2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7475 10528 bytes

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