Malicious PDF — malware analysis report

Static analysis result for SHA-256 057da4b5a2206160…

MALICIOUS

PDF

37.7 KB Created: 2020-08-30 09:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd974c7607dfb189580f6afe7bd12baa SHA-1: bd2d93d4406399cb05f4c7f3d8071b6e17beb2a6 SHA-256: 057da4b5a220616010e11439ea955e89b9f0a5574d855308632b49d2c3e13a53
154 Risk Score

Malware Insights

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

The PDF document contains a link farm of multiple external PDF links, with one primary URL identified as a malicious redirector. This suggests an attempt to manipulate search engine results or to direct users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.me/wix?keyword=chef+venkatesh+bhat+paneer+butter+masala
    • http://tjf.cloudz.pw/download?file=pane
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_c16c77cffb8b49a396c882f3cb254a0a.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea766fa082de4f4b8f9cab86dc92a606.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_6388a728aec44fb688db41c777848d24.pdf
    • https://static.usrfiles.com/ugd/7e6083_59b7d51a37664721a749e08319768a9d.pdf
    • https://static.usrfiles.com/ugd/4dd980_83a6eca7e66743e8bfa5e5287dcfa621.pdf
    • https://static.usrfiles.com/ugd/b8c837_9861b9e5a22748e091115c8e140b1ca8.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_1436b64ac9e941c8b6948903569eb08f.pdf
    • https://static.usrfiles.com/ugd/625844_28f4fc71591244d5916601c89ab0d56c.pdf
    • https://static.usrfiles.com/ugd/73f3b0_0dfd681eaee74e839d6b091f72adc55c.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d8a4bc43a6140498cef211b3bd3bf4d.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_off000056aa.bin
0e00324a748e95e7d89d40eb1be690a2254bb95e1736aeed6f8ec67d9506a489		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56AA 5312 bytes
font_01_sfnt_off0000688a.bin
6dda040c870ae1ea6786d45c94e438c01071ea162b9458e9be3f22fbf044a1e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x688A 9924 bytes

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