Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72ab3bda4e421ad…

MALICIOUS

PDF

68.4 KB Created: 2020-09-16 18:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a56def5da74de0045b03d6bf0f1091b2 SHA-1: 4b2627134f28e186b84bf5d4e9588a772fae79d6 SHA-256: a72ab3bda4e421add4bd9e47e45adb7eca7a363df17d0cb57fed1c9f9926d3a4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The sample is a PDF file that contains a link to a known malicious redirector. The document body, though heavily obfuscated, appears to contain text related to a 'Brookstone mobile mini speaker manual' and the malicious URL itself. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing confirms the presence of a link to malicious infrastructure, and the ML_NYX_PDF_MALICIOUS score indicates a high probability of malicious intent. The PDF_SEO_LINK_FARM heuristic suggests the PDF is part of a larger link farm designed to attract traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ttraff.link/wix?keyword=brookstone+mobile+mini+speaker+manual In PDF document text
    • http://files.bernardcassiere.fi/uploads/1/3/1/1/131164063/lazezamom.pdfIn PDF document text
    • http://sabetudu.mizunagardens.com/uploads/1/3/0/8/130814070/6651835.pdfIn PDF document text
    • http://files.geoffrebbeck.com/uploads/1/3/0/7/130739616/nuvedukuxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://040d4067-b05d-49e5-9af8-77cd66d2480c.filesusr.com/ugd/fedf23_19928c7ee08c4695b62a030bc4379d68.pdf?index=trueIn PDF document text
    • https://e166442c-c098-4ba2-904b-9b17db72a3a6.filesusr.com/ugd/5438e3_00234585eb2441a189cabcbb30b408dc.pdf?index=trueIn PDF document text
    • https://54784421-7987-4ab8-a6c9-9e2d4fe5adcc.filesusr.com/ugd/2813e2_f367a65ea403457a87779c1007af53a9.pdf?index=trueIn PDF document text
    • https://3f2d8184-6035-49b6-b210-1ade47d6b5a1.filesusr.com/ugd/035627_447e9311705848c5857cf8dedaea154d.pdf?index=trueIn PDF document text
    • https://8b19e99c-f1ca-4470-b8ce-f61ff9744cdf.filesusr.com/ugd/11b39a_a25f603a5c934738b48fb2191ed96850.pdf?index=trueIn PDF document text
    • https://e1a57fa8-4fee-4220-8702-b429eec77624.filesusr.com/ugd/e50c99_58e6ea2785fd468bb80650e7cbe90085.pdf?index=trueIn PDF document text
    • https://d9bff7a2-9908-42eb-8809-4509abcf0ba2.filesusr.com/ugd/1e52da_c3fa4aebffcd45008eb779821e995af7.pdf?index=trueIn PDF document text
    • https://d522d129-e086-4835-ac60-b2d349472a0f.filesusr.com/ugd/7f614e_4d9064197b594df790084558ab66b88c.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30E 5220 bytes
SHA-256: 65ec92db2f6fd8925b46d6988d98452bbd017a5b8fa080a7b205faff8c5bd653
font_01_sfnt_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 15304 bytes
SHA-256: d95996f4686a2173c25a4394e7aa38425607fdf3af920ea4cc5a0c5eafce660a

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