Malicious PDF — malware analysis report

Static analysis result for SHA-256 695b2f2f3aae20b8…

MALICIOUS

PDF

47.3 KB Created: 2020-11-09 14:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ab7200abc313e837c0ee34078ea55809 SHA-1: c80722cf2943ef2ab803ebe3ca8b0f0bcaebd94b SHA-256: 695b2f2f3aae20b836bdc77910cf9c20fe0124e72a7e2fb84c41d43e41607d02
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple critical heuristics as malicious, specifically for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many of which point to PDF files hosted on various platforms, suggesting a link farm or SEO poisoning attempt. The primary malicious URL identified is https://cctraff.ru/123?keyword=algebra+1+regents+june+2017, which is likely used to redirect users to further malicious content.

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://cctraff.ru/123?keyword=algebra+1+regents+june+2017 In PDF document text
    • https://lelewamopubexab.weebly.com/uploads/1/3/4/3/134324934/wixoj.pdfIn PDF document text
    • https://xidawelopumez.weebly.com/uploads/1/3/4/4/134439163/wufepagegirebu.pdfIn PDF document text
    • https://xawuvokepixa.weebly.com/uploads/1/3/4/6/134617960/28cda51cc83674.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/gedemeti_vemopu_nurowetovideler.pdfIn PDF document text
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/taximuvuxo_xobeze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e558dc3-ab8d-459d-ade7-a547a2535ae5/38582639377.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/jowuxikezobilom.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/derenavupigamenozoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c92ae30c-7c63-4d0c-9e39-d2ab9afb9928/mimerivazelejoto.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/brgschaftserklrung_miete_vorlage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c74a3cb7-6dfa-4407-9105-3f6bc61efa09/karate_stance_vs_boxing_stance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/131df0da-0290-405c-8e27-1c2f5dd8e741/xupijuz.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_off00007707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7707 5464 bytes
SHA-256: b084129af6c055d44ba8377524fb7264f6846367f0d3c59ecc2828fe47bd35a6
font_01_sfnt_off000089be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89BE 11780 bytes
SHA-256: 682531c83a6c2cf55b54eb5008b8c97a4c636ddc30d009e1a20706e0b41f9010

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