Malicious PDF — malware analysis report

Static analysis result for SHA-256 5717eb1e81c1aac5…

MALICIOUS

PDF

40.5 KB Created: 2020-10-11 16:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 4e856150ab406ccd71f1d0cdd8d2fc83 SHA-1: 351c20d9d8ab7973e4b7e549786539372c5e9f1d SHA-256: 5717eb1e81c1aac55831045783e0f7e0554283cda466709c4f78d5ff075a9129
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=graphing+lines+and+inequalities+worksheet In PDF document text
    • https://site-1048166.mozfiles.com/files/1048166/39098416018.pdfIn PDF document text
    • https://site-1037115.mozfiles.com/files/1037115/8522630261.pdfIn PDF document text
    • https://site-1038510.mozfiles.com/files/1038510/fosaxesagewokenomamikej.pdfIn PDF document text
    • http://files.cartime.org/uploads/1/3/2/6/132682232/8793459.pdfIn PDF document text
    • http://files.cedarcat.net/uploads/1/3/2/6/132695472/padejimasiv.pdfIn PDF document text
    • http://jalugutab.diazcounseling.com/uploads/1/3/0/7/130776661/vagakitiso.pdfIn PDF document text
    • http://files.proorganizerlindsay.com/uploads/1/3/0/7/130775176/8cf7c59cf20.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/28413f54-670b-4b17-98e9-580336a16dc5/40664381854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/019f5157-ddc1-4e0c-96ba-8fa723f07c45/megutazajolikugiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f85dd26e-451b-43fc-a8f2-09584a28130e/varisesowek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0426affd-a4d4-4e5d-8be2-456b4f84e5cf/51380042070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05227664-0816-4365-9910-816cd71cfb0f/xulaxiravibikez.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_off00006030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6030 5532 bytes
SHA-256: 8af0c96d5e418fdeb457edaa8804260983fd5d63def87e40d423c4208fd11d5c
font_01_sfnt_off00007310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7310 10000 bytes
SHA-256: 4edb4fa90ff4d8f88b9e6f83f0efddcbc1ee037f8d7d4960c442e40445476c3c

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