Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b522aa894389ef8…

MALICIOUS

PDF

37.2 KB Created: 2020-09-30 14:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a8fd937b76c8081917f5dc098ca06672 SHA-1: 76fafc0582a654109f2a6372a588a7d974530181 SHA-256: 6b522aa894389ef81fd328dfd13e6b35e0a1d5613dc56404c96f6d2c788f28e4
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://cctraff.ru/strik?keyword=cadena+de+abastecimiento+libro+pdf In PDF document text
    • https://site-1036818.mozfiles.com/files/1036818/vesinijoto.pdfIn PDF document text
    • https://site-1036950.mozfiles.com/files/1036950/82154189416.pdfIn PDF document text
    • https://site-1037193.mozfiles.com/files/1037193/11885347917.pdfIn PDF document text
    • https://site-1037890.mozfiles.com/files/1037890/dowemoditamevexifitobed.pdfIn PDF document text
    • https://site-1037149.mozfiles.com/files/1037149/galikajugitewefo.pdfIn PDF document text
    • http://files.redbeardpress.org/uploads/1/3/0/7/130739415/6667072.pdfIn PDF document text
    • http://files.ashleyjanaeart.com/uploads/1/3/1/6/131606331/pelozalul-mulazimitiko-padazakased.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/65152ed2-ba34-458c-aa8d-81951aec4505/poxirivuvajagodinewatav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bedb1b67-6c4a-42ad-abf3-1407994e5da0/88198223613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b08a92-16ec-43bb-909c-28782d04db81/40250124519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cccbd70-391d-48a5-8168-644b55e23ecf/47262384197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf68908-e927-49d3-908a-f796386f129f/rajalixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e80a705-7e46-46f1-ba8d-a9853a899ff4/sekonirepivatijovewagufog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c536b946-1551-40fe-8de4-2144606b7043/vonawulatinaxobuvuli.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_off00005138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5138 5344 bytes
SHA-256: f95113ae3e7d959aaec287bab3831aa716ff20dce0729406694bd6a40d9f38d4
font_01_sfnt_off00006343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6343 10852 bytes
SHA-256: dbc6275026371e41570076ea691b8254a176dafb13642ce775fa86d3c4bc8265

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