Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de8c51dd1ab86b4…

MALICIOUS

PDF

52.6 KB Created: 2020-11-04 19:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a21f275b60f1813903d0869cd4eb1a34 SHA-1: 39bb09bfe54284433b9854ca220441078b229d39 SHA-256: 6de8c51dd1ab86b426af8382feb1a42a603baa4fd93e13b311c73306dfb2188b
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that is also referenced by the heuristic, suggesting the document's primary purpose is to facilitate access to this malicious resource.

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 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/123?keyword=electric+power+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_5fa0d808eac18.pdfIn PDF document text
    • https://novafonofijufi.weebly.com/uploads/1/3/4/4/134480525/3221851.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/museluti.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/c2f0c0d.pdfIn PDF document text
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/redikerij_fevegite_nokujugutu_pitonatiwu.pdfIn PDF document text
    • https://fiselowozol.weebly.com/uploads/1/3/4/3/134366189/batuwavuvexigal_xifokekikop_vopewipaze.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/35735473-482a-4a32-9bc0-731c85e4e9fc/florida_dcf_forms_work_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dec4ec4-b3d5-448d-b405-2782d1a9d1c0/walimefobasavoveloku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29e2955f-7453-4015-be7c-6840a69940fc/72953304107.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/xibasekoj.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/52658183276.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/andhra_pradesh_tourist_guide.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9191 4924 bytes
SHA-256: e97ef95021a8d5b2e39e643d1ee445661ce339007a2dbbf56494fd3144be9602
font_01_sfnt_off0000a269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA269 10304 bytes
SHA-256: 95f313d574ac13fcb77637c6dbd287f459dda36489421d916c1eed2586ec3a80

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