Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2cf1c7e1fc7a74…

MALICIOUS

PDF

39.0 KB Created: 2020-10-05 07:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6f37eeff5cd12568769e9c2828308b75 SHA-1: c900cc9d01513c2deb4458b0eb18fa3d9b175482 SHA-256: ba2cf1c7e1fc7a749ea6f5bfbbb18a681c3e23cb2f81761eafd9f3db7c91f35b
184 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The primary lure appears to be related to 'reading sonic archie comics online free', which is a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external links and the ML classification strongly indicate malicious intent, likely to download a second-stage payload or redirect to a phishing site.

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=read+sonic+archie+comics+online+free In PDF document text
    • https://site-1042013.mozfiles.com/files/1042013/nemimaman.pdfIn PDF document text
    • https://site-1036973.mozfiles.com/files/1036973/21054523120.pdfIn PDF document text
    • https://site-1048288.mozfiles.com/files/1048288/14185154590.pdfIn PDF document text
    • http://files.katherineeverett.co.uk/uploads/1/3/1/3/131381433/vugokawefiwuj.pdfIn PDF document text
    • http://files.dualityinteriordesign.com/uploads/1/3/0/7/130775606/522d6968cf07dd.pdfIn PDF document text
    • http://xeves.rejuvenateconsultant.com/uploads/1/3/2/6/132681999/nabegozed_rinurivifuda.pdfIn PDF document text
    • http://files.kaseandjase.com/uploads/1/3/1/3/131379382/wisafowo_navutesitawem.pdfIn PDF document text
    • http://rokero.integratedcultures.org/uploads/1/3/1/0/131070374/sibojadin.pdfIn PDF document text
    • https://site-1039456.mozfiles.com/files/1039456/33475298319.pdfIn PDF document text
    • https://site-1040180.mozfiles.com/files/1040180/nukukapewoxose.pdfIn PDF document text
    • https://site-1037837.mozfiles.com/files/1037837/furakepajosowogu.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://cdn.shopify.com/s/files/1/0428/8544/7833/files/vofejorexifanupuzela.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1238/1598/files/vawamepexex.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_off00004dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DBF 4976 bytes
SHA-256: ea284f92c7c0c652dca083e8e98b72c22822058ad2b19b188bda5b18268b0f85
font_01_sfnt_off00005e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E67 10020 bytes
SHA-256: b6f0c84b00564a7909c5212408f02d28a87bcd0dd66068c50ac647b791134132
font_02_sfnt_off000080a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80A0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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