Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd2ffd176660145…

MALICIOUS

PDF

42.2 KB Created: 2020-11-04 17:48:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 897e33ca5d294023287e1f945e18d08c SHA-1: da48544c602156ac2ec7a5ab9a3115ebdf0bcce1 SHA-256: 0cd2ffd1766601451b54b937f972b01542c97bb5b9472ed9e524bce6fa9f24a1
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/strik?keyword=ga+social+studies+book+online+5th+grade In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_5f8e646cab3f2.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/piwutesufeburoset.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5fa114da8e648.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/miviliwipeziludeb.pdfIn PDF document text
    • https://wilofera.weebly.com/uploads/1/3/4/4/134488721/firapew_zuxozelabuz_zalevafel_vonep.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/2ab236e4-719d-4c24-930e-ec6eb6d21e54/circle_theorem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d022777-e974-4b48-9fcb-a9d7b997d5d6/xagekerelunupitikad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d1ba75f-d12c-4024-83d7-584c64593cf7/xiwifamixodu.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/72427457730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60382ff0-a5f5-4cfc-a0d7-b22d9bdf30c7/57616865157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6fec26-a2ae-47a7-9d8c-479b2daee236/meat_jun_sauce.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_off000065a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65A1 5560 bytes
SHA-256: 8176b748c2717c4a72f75015d1635c9e939d74a6bf5587d3b86654d49c9a6ac9
font_01_sfnt_off00007885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7885 10292 bytes
SHA-256: efe0a8cb083d74655e7340c19fd9492c0992253859f6fad68bad26b82d424ad4

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