Malicious PDF — malware analysis report

Static analysis result for SHA-256 3004e5f9c14571f0…

MALICIOUS

PDF

41.1 KB Created: 2020-10-08 09:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fa625eb3d28923a010120cd8fcd21eb6 SHA-1: eca91a790c684b7f983209dd0228ac08d56e0ec9 SHA-256: 3004e5f9c14571f08b1b8a97b6b1915c14d9c606e067081d81e6b2e95c05d413
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF document contains numerous embedded links designed to redirect users to malicious websites. One prominent link directs to known malicious redirector infrastructure at 'https://ggtraff.ru/strik?keyword=anatomy+and+physiology+coloring+workbook+ch+11+the+cardiovascular+system', which likely serves as a gateway to further malicious content. The document also includes algorithmically generated URLs hosted on disposable domains, indicating a link farm strategy to distribute malicious content.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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://ggtraff.ru/strik?keyword=anatomy+and+physiology+coloring+workbook+ch+11+the+cardiovascular+system In PDF document text
    • https://site-1039476.mozfiles.com/files/1039476/3545148206.pdfIn PDF document text
    • https://site-1036626.mozfiles.com/files/1036626/15958479795.pdfIn PDF document text
    • https://site-1043160.mozfiles.com/files/1043160/kazilebijef.pdfIn PDF document text
    • https://site-1037233.mozfiles.com/files/1037233/87943464566.pdfIn PDF document text
    • https://site-1039814.mozfiles.com/files/1039814/29686787697.pdfIn PDF document text
    • https://site-1040427.mozfiles.com/files/1040427/nujowefigakumofeso.pdfIn PDF document text
    • https://site-1036975.mozfiles.com/files/1036975/46132657431.pdfIn PDF document text
    • https://site-1037122.mozfiles.com/files/1037122/12865939244.pdfIn PDF document text
    • https://site-1038782.mozfiles.com/files/1038782/lojogi.pdfIn PDF document text
    • https://site-1036951.mozfiles.com/files/1036951/vototupuwafiwilab.pdfIn PDF document text
    • https://site-1037094.mozfiles.com/files/1037094/pasesanodomom.pdfIn PDF document text
    • http://zabemu.nccsecec.org/uploads/1/3/1/6/131607208/4ee98c28ab325d.pdfIn PDF document text
    • http://tajadinur.karmaroadgettingofftheroundabout.com/uploads/1/3/1/8/131856293/2730710.pdfIn PDF document text
    • http://kufov.momentumsportpsych.com/uploads/1/3/2/8/132815004/vakazedurubudo_dipexidi_gogimerom.pdfIn PDF document text
    • http://risema.14jazzorchestra.com/uploads/1/3/0/8/130814328/1665548.pdfIn PDF document text
    • http://files.christinesmyczynski.com/uploads/1/3/2/7/132712093/e1e0485f104a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00005f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F24 5988 bytes
SHA-256: d9b80ac9471125efe7931414b1a8a182d3f4edcec757d6621a9449e8d95aac33
font_01_sfnt_off0000737d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x737D 10260 bytes
SHA-256: dfa86844eb85d90cd34b5a1df498441eb57198dc3fbe7e9e5d60f941b091d2a3

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