Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c0bcccd51e191e…

MALICIOUS

PDF

55.9 KB Created: 2020-10-06 19:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 3a25d2965c6476b3b8761bd756691cdf SHA-1: 974f30d3bd1eae4fece364b19a40cfba38288e25 SHA-256: b4c0bcccd51e191e7571778034c9520567ba2fdcc5d7989d9927412d83143728
184 Risk Score

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://gettraff.ru/strik?keyword=statics+and+mechanics+of+materials+5th+edition In PDF document text
    • http://lebat.2030portal.com/uploads/1/3/1/8/131857580/602733.pdfIn PDF document text
    • http://tononibif.momspantrykitchen.com/uploads/1/3/2/7/132740708/f850908a.pdfIn PDF document text
    • http://files.peteachersclassroom.com/uploads/1/3/1/3/131384145/c6a97.pdfIn PDF document text
    • https://site-1037212.mozfiles.com/files/1037212/2907966020.pdfIn PDF document text
    • https://site-1037276.mozfiles.com/files/1037276/68730622731.pdfIn PDF document text
    • https://site-1038792.mozfiles.com/files/1038792/legibujabakalazakuzofogal.pdfIn PDF document text
    • https://site-1038709.mozfiles.com/files/1038709/59077226553.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/fa7a19eb-e58e-4f25-9a98-efcc9e1d8edc/gojofojelazujemokixowaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77171ba3-1e64-4d59-8df6-cb28922e43a8/33146772302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da4bd078-fcd8-4bce-bfd3-45c4b9eb5957/gugegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f495769c-7509-4818-91ca-8f83ba5194b4/59320594951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd2aa9a-c0c3-4cc6-ab48-9ed4aeacdfda/13774898221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb31e25-c595-4578-a1df-1dfcd3662401/jimifopuponasubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90e25e82-1bcd-49e0-b9e1-f344091a0e73/bawurodizeturirute.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_off00009ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CEB 5488 bytes
SHA-256: deb9c24926aef7c075063100b44321e08af6cbe7514b9f701cde657c10e41c79
font_01_sfnt_off0000af6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6A 10312 bytes
SHA-256: c7449d748339436f512a5088f56c8636184fe0e2cef93161619bd6fc2fef2744

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