Malicious PDF — malware analysis report

Static analysis result for SHA-256 7269fb5a05676cf9…

MALICIOUS

PDF

34.9 KB Created: 2020-10-30 10:20:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 24333016e5ac23681fd71a0ea4d011aa SHA-1: 75ddb6e1e7b4f11738254aeb732c22bed676c7d8 SHA-256: 7269fb5a05676cf91c3894d9ee288ca56a7a980324d5a38111b3a4d261900895
124 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a likely attempt to redirect the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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/123?keyword=process+plant+layout+and+piping+design In PDF document text
    • https://zinawadasug.weebly.com/uploads/1/3/4/3/134312837/fiborasederedap.pdfIn PDF document text
    • https://rutaluxunenore.weebly.com/uploads/1/3/0/7/130740368/ruxixakukutego.pdfIn PDF document text
    • https://penopetidurip.weebly.com/uploads/1/3/2/8/132815040/dbf9b.pdfIn PDF document text
    • https://tanifovekula.weebly.com/uploads/1/3/1/3/131379991/cf3e6d.pdfIn PDF document text
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/a376ee.pdfIn PDF document text
    • https://bekarofadu.weebly.com/uploads/1/3/4/3/134346179/texobokupap_moxidutunu_xesel.pdfIn PDF document text
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/38ea02db.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/eb6dd686-33cb-4eb0-9e0d-73138ef4ec74/patejinekuwaje.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/dubategofuziga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d73361c-b4ff-4353-9ac8-79d2b24520b0/operation_werewolf_chapters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37402530-076f-4fdc-af7c-e3f8a1b24087/58608184575.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/17494402883.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8303/7860/files/43328601784.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/judea_pearl_causality.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2317/8656/files/85104280806.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/classroom_management_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/administrao_pblica_augustinho_paludo.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_off00004aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AA6 5344 bytes
SHA-256: 78c07f66bd31e95c4d734e17c661fca6daefcb08d710607ab2793451397c7066
font_01_sfnt_off00005ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE8 9968 bytes
SHA-256: eb75dfe8cfbcf38b36ab89875360d698dabe201b0fd8d4729ebd746ecf924278

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