Malicious PDF — malware analysis report

Static analysis result for SHA-256 66622d046c34d144…

MALICIOUS

PDF

43.6 KB Created: 2020-10-12 02:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 7aa0308ca49cd0c07878024584efd927 SHA-1: 92b9891cd6c9781c4fc3f38661c542516b658d45 SHA-256: 66622d046c34d144b54c4e78080d1fdf4b83a7abd3117c11129037f5e5fd3755
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector infrastructure at `https://cctraff.ru/pify?keyword=world+biomes+worksheet+answers`. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm hosted on disposable domains. This suggests the document's primary purpose is to redirect users to malicious sites, likely for further exploitation or phishing.

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://cctraff.ru/pify?keyword=world+biomes+worksheet+answers In PDF document text
    • https://site-1036644.mozfiles.com/files/1036644/58361196148.pdfIn PDF document text
    • https://site-1036735.mozfiles.com/files/1036735/75817223376.pdfIn PDF document text
    • https://site-1042501.mozfiles.com/files/1042501/vomudoven.pdfIn PDF document text
    • https://site-1036826.mozfiles.com/files/1036826/popikixojapopelo.pdfIn PDF document text
    • https://site-1041934.mozfiles.com/files/1041934/rukaritakututedigurej.pdfIn PDF document text
    • https://site-1048209.mozfiles.com/files/1048209/ziralul.pdfIn PDF document text
    • https://site-1037188.mozfiles.com/files/1037188/39364530353.pdfIn PDF document text
    • https://site-1038831.mozfiles.com/files/1038831/masonakadakem.pdfIn PDF document text
    • https://site-1038416.mozfiles.com/files/1038416/35671235777.pdfIn PDF document text
    • https://site-1038944.mozfiles.com/files/1038944/wopoworozodat.pdfIn PDF document text
    • http://pomovulol.gravediggersball.org/uploads/1/3/2/7/132740541/vasox.pdfIn PDF document text
    • http://fajelev.skydanc3r.com/uploads/1/3/1/1/131163981/e5df7205d6c365a.pdfIn PDF document text
    • http://files.thesoapshepherd.com/uploads/1/3/2/7/132740700/kibitowosigowuw_tozabatirome.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/02c736d3-0fa5-47cb-b926-178bef4cef20/fozujitojotuporiximuzeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3caaa22f-b7bd-4192-958b-848429147859/gepabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b982f43-7a71-45c8-80e6-9411341aeb69/todibabazek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14037739-2e89-4c24-b251-f76b2eb6b560/fapupeso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d6c5b24-5c77-43d4-82c7-561f41cc022f/90071053693.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_off00006c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7E 5376 bytes
SHA-256: fdf6498b63078e222b00df9021f5e02cc2b7fb921c22245f0bd84ffffad78079
font_01_sfnt_off00007eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB7 10032 bytes
SHA-256: 2139c26d495a1989725745612fb05d0679a0127f3696f0c0c297b6affca46e60

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