Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e056e6bc0eaa86…

MALICIOUS

PDF

40.6 KB Created: 2020-10-05 08:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 87e611d08868c1d70ca184bebab735c1 SHA-1: e983cb930297e54d4be6985b5fb3b18d39657823 SHA-256: a3e056e6bc0eaa860771f71c48793b5e050329fedfca37ea45ef3f3a1d08f0b2
192 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=amelie+sheet+music+pdf+piano In PDF document text
    • http://files.healthycleaningsolutions.com/uploads/1/3/1/4/131406365/kinupigebe.pdfIn PDF document text
    • http://files.whiskeyrowpenthouse.com/uploads/1/3/2/7/132710719/labotuxiwu.pdfIn PDF document text
    • http://files.elemenoenglish.com/uploads/1/3/1/1/131163833/302899a0bdf.pdfIn PDF document text
    • https://site-1036625.mozfiles.com/files/1036625/27636529358.pdfIn PDF document text
    • https://site-1039661.mozfiles.com/files/1039661/60975841200.pdfIn PDF document text
    • https://site-1036734.mozfiles.com/files/1036734/63246316781.pdfIn PDF document text
    • https://site-1037897.mozfiles.com/files/1037897/pakasunifoled.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/c72f5502-5a2d-4663-9157-c9dc0468becc/barow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47503b33-7ed2-4d89-916e-307d48b605f0/gosizupameporop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9acca9a5-9c41-404d-9aa0-bdebcaf44ddb/3511769348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a530104-4c11-40f5-ae8a-0a80e9f4ea28/44800952905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2274f3b4-75b4-4a91-8f48-8e4ff3aa1245/subode.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1428/1625/files/79341704259.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0293/6477/files/pilani_wisconsin_jeevansathi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/jumping_jack_compactor_harbor_freight.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8034/6525/files/kilonu.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_off00005e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7B 5288 bytes
SHA-256: a7e1d013594ecc6f0c405aa9d3a62a95933f6cdd9efdc00a97f880ba096b7cdc
font_01_sfnt_off0000705b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x705B 10584 bytes
SHA-256: 3351222a91981f8eaf45d0d337f2b771f0bbe2976d8cbebcc118fe705c8be605

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