Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4b02c97db858b6…

MALICIOUS

PDF

84.3 KB Created: 2020-11-17 20:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 50b54f261eabe3046d346cc4c79fd405 SHA-1: 964491d11585267d88200a509089849745ff04ff SHA-256: bb4b02c97db858b6b4395b8801cccf7c24bc45d42a2e14fed8af74f2b6bf7acc
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. It also contains a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The presence of a password-protected archive lure heuristic indicates an attempt to bypass security controls by encrypting a payload. While no scripts were extracted, the embedded URLs and heuristics strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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?utm_term=philosophy+final+exam+practice+test In PDF document text
    • https://tesokumerapaj.weebly.com/uploads/1/3/4/5/134522001/pujewagixam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5f885286ce389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_5f9b44aad1fa8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/naxizugenabi/merge_dragons_cheat_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/manorama_year_book_2018_english.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/biozone_international_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/winrar_password_remover_tool.pdfIn PDF document text
    • https://s3.amazonaws.com/zukukelejurotef/48097360855.pdfIn PDF document text
    • https://s3.amazonaws.com/timafatafej/mr2_spyder_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/31801341455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d68ea420-1d08-440e-ade3-df8a51a70f53/boninojibu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 5212 bytes
SHA-256: 76389109504f60c79229328a6001c3cce1424e2e3a71684ba2f2d1c72ee75298
font_01_sfnt_off00011364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11364 10172 bytes
SHA-256: 6880dbc71ee3706b92b509c6881ea0a2193496ee4cc88cc0806aa18ffce895ac
font_02_sfnt_off000135f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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