Malicious PDF — malware analysis report

Static analysis result for SHA-256 47df2ab7fe445eda…

MALICIOUS

PDF

43.7 KB Created: 2020-09-11 08:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fe104f1b25659c706f82bf82ab6d7ac4 SHA-1: 5f1debb1f296843d8650f234a4b41c5cb60254c2 SHA-256: 47df2ab7fe445edab1089eb463c8b3f1e8d42efadef4a994e45bfd67de7db242
184 Risk Score

Malware Insights

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

The PDF document contains a significant number of embedded links, many pointing to external PDF files hosted on various domains, suggesting a link farm for SEO manipulation or to distribute further content. One of these links, https://ttraff.cc/wix?keyword=beethoven+moonlight+sonata+2nd+movement+sheet+music, is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links and the redirector indicate a potential for malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.cc/wix?keyword=beethoven+moonlight+sonata+2nd+movement+sheet+music In PDF document text
    • http://files.brigitteyearman.com/uploads/1/3/1/4/131483009/sidabobalesaxemodo.pdfIn PDF document text
    • http://files.alaskabg.org/uploads/1/3/0/8/130813427/bb0a87cac38dc.pdfIn PDF document text
    • http://files.fairtradecalgary.com/uploads/1/3/1/0/131070294/1371075.pdfIn PDF document text
    • http://jowulixov.brickandbaking.com/uploads/1/3/1/4/131438667/fekidobuz.pdfIn PDF document text
    • http://kijeneg.joshuapiven.com/uploads/1/3/1/8/131871699/18d6e9adaa9.pdfIn PDF document text
    • http://files.jasoncons.net/uploads/1/3/0/7/130776016/b5062.pdfIn PDF document text
    • http://files.lifediscipleshipministries.ca/uploads/1/3/1/0/131069886/5924937.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_003c288ff9d343b18038989854b6a8b5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_85635d7466d743ad8e7bf55c2c99e269.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3b7182_c4351af385674993899735e7767d2554.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6350c7_a1c5c9261b814ed8b1f8fef120b86fb8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c7a620_db60a3f4161e4d7e80e021fae0dade91.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/abd6ea_bee266394fd742a480ab277f47a07501.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9E 5500 bytes
SHA-256: 4f2726afb07b72b57c9a611ab812a1423d606c987213fcb234a057e6ffaea379
font_01_sfnt_off0000713a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x713A 14884 bytes
SHA-256: 8619e0b9a8df571e74a543d5324b737991f7153c4dc8668a05d03a6f08703f53

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