Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f54c099774c2e1…

MALICIOUS

PDF

54.8 KB Created: 2020-10-07 04:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9cfb3aba92889a9305c614dbeb54089e SHA-1: 19ab9e77f7f6135de7d652fb85b3d0eba253d571 SHA-256: 33f54c099774c2e13912c1c26d676c828caf27c6abd5207b17e4753a170fadec
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and known malicious redirectors. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a likely attempt to redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=pokemon+mega+evolution+gba+cheat+cod In PDF document text
    • http://viwutu.whitemoosephoto.com/uploads/1/3/1/4/131482988/vumonojibiw.pdfIn PDF document text
    • http://files.plaiconsulting.com/uploads/1/3/0/7/130775694/2585090.pdfIn PDF document text
    • http://jefifeliv.raypecbasketball.com/uploads/1/3/0/8/130874493/mekuraxolor_duves.pdfIn PDF document text
    • http://getivoxu.johnhamptonphoto.com/uploads/1/3/0/7/130776436/4f9ac681.pdfIn PDF document text
    • http://feponage.donnadalton.us/uploads/1/3/1/4/131453463/7041522.pdfIn PDF document text
    • https://site-1043043.mozfiles.com/files/1043043/pudubupajemugulajos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5464/7446/files/eric_carle_books_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0870/5187/files/40992372735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e47a562-f1d2-4cd8-9b8d-d94507ceb928/bebodavumika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6c9f2e6-0d45-4eb7-b797-1edc4206e7de/33328138212.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_off00008a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7D 5344 bytes
SHA-256: faee0a6ac1c3ac1afb72de4467cb2650659c5c82d369a8cb05f2d03f9df4733b
font_01_sfnt_off00009c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C92 16056 bytes
SHA-256: 89b82e2b06cfcbf037a833d0fac8782afee982440fe53fa5ea18229bbc0bc6d1

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