Malicious PDF — malware analysis report

Static analysis result for SHA-256 83aba59a8ae7a32f…

MALICIOUS

PDF

45.6 KB Created: 2020-10-02 06:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a59a7455bac07f7ff7a437b4b530c094 SHA-1: 63d8d88a222ad445486284070856d0b1204768dd SHA-256: 83aba59a8ae7a32f4b3e1cc8183b4c9bd66b88a9b3b23d5c65340c07d5a91600
124 Risk Score

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/strik?keyword=turnover+intention+scale+pdf In PDF document text
    • https://site-1036646.mozfiles.com/files/1036646/93196696346.pdfIn PDF document text
    • https://site-1037061.mozfiles.com/files/1037061/27733203808.pdfIn PDF document text
    • https://site-1036960.mozfiles.com/files/1036960/sezifesexifakob.pdfIn PDF document text
    • http://solamefu.wokingmassagestudio.com/uploads/1/3/0/8/130814011/043bc7.pdfIn PDF document text
    • http://files.rachelriley.net/uploads/1/3/1/0/131070173/329456.pdfIn PDF document text
    • http://files.mrschaeffer.com/uploads/1/3/1/6/131636941/c62227cf7.pdfIn PDF document text
    • http://files.longclublambs.com/uploads/1/3/2/8/132815296/fafewavalomij.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/7b305fe0-e6da-4379-9aae-0c359e16b55a/34328247383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f7d423f-4937-4509-a18c-35e3bd578934/vugero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b11de7f8-f438-45ab-a667-739dae72e74f/49184987538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/184f4940-8f40-4768-810b-963cc68fd2e7/56808903252.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/4544/9639/files/huffman_coding_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/pozowuvaxokoxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1212/6880/files/68762249386.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_off000073e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73E6 5156 bytes
SHA-256: 71cd09ace8f98becf7b46d83ab08d0525e69a525957d7e38c483f48c9baa789f
font_01_sfnt_off00008588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8588 10540 bytes
SHA-256: 3b2553e2c96fc2fb017ad4c518c0ad9dfcaab3ddc5c604b026574d009c839c1d

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