Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58e0ee8d55c9f6a…

MALICIOUS

PDF

44.5 KB Created: 2020-10-28 19:47:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b39dfb1533d591f47590f5ae6b81595b SHA-1: eb28b41f4ffef9d5d2ccb71ad6be76e95a312061 SHA-256: f58e0ee8d55c9f6a18bcd7b258a0975ded0e0769276300e4b7af878e741e15f2
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://cctraff.ru/strik?keyword=dsm+v+specific+learning+disorder+reading'. The document body also contains this URL, suggesting it's the primary lure. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign but some are unknown. The ML classifier 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 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.
  • 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=dsm+v+specific+learning+disorder+reading In PDF document text
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/9885693.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/favodepoti_lorobepovanid.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/lepegetidemevenovod.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/9560931.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/tous_les_album_de_tintin_en_gratuit.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/approval_addiction_joyce_meyer_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8266/1532/files/kekizimejiwalobezoba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/4692/9052/files/zixitivakovigobineza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3da70e-9f68-49f4-9fce-32f92ef24c70/craig_mecanica_dos_solos_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/gravady_las_vegas_jobs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0314/9479/files/chrome_download_failed_network_error.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/clipsal_catalogue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/277a4a3f-8a0d-4002-aa45-9806e6d4d5f8/human_physiology_an_integrated_approach_7th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5377/7047/files/niwome.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/zoligebose.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/math_formulas_for_competitive_exams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4dc612-cc96-4542-a36d-8f73f1115526/60186325600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f38ad9b8-02cf-42b4-93fe-6d82c9cd37b3/lariputaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/926ce02e-6d36-4346-bf07-3c01f5c9092a/60501337970.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2621/8647/files/wigorifowupuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ec7e59-9fe4-48f4-9166-7eeb58ef6967/ruzukadadivotize.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_off00006e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E25 5532 bytes
SHA-256: 887616839cd8eee2745cd6c8116b32f37e8196c3b2ad66ae93e636d384e1d339
font_01_sfnt_off000080eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80EB 9852 bytes
SHA-256: c271d287cc4377db57f3d6ad2cb54b3a46c60070f70fee4ebe218fe1ef478bf1

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