Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7fa39cbca44dd1c…

MALICIOUS

PDF

40.6 KB Created: 2020-11-05 04:52:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e4d469d993a7331c0de3ba599edff5fa SHA-1: 18d6f04462b33568b88f6548dba3d8e12a0d9d7e SHA-256: f7fa39cbca44dd1c335214325dca1cf9d7a1e8bb13295eb2dda1add6f100108f
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, specifically identified as a redirector. The document body, though heavily obfuscated, contains text that suggests it is masquerading as user manuals to entice clicks on the malicious link. The ML classifier also strongly indicated maliciousness.

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=coby+user+manuals In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_5f8db431b8a76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_5f9489686836e.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/xubedetunizanojanum.pdfIn PDF document text
    • https://zubisixoligifi.weebly.com/uploads/1/3/4/4/134479514/ae6aee425c8e07.pdfIn PDF document text
    • https://rurizurerenudiw.weebly.com/uploads/1/3/4/6/134649160/gaxezalasuliva.pdfIn PDF document text
    • https://wiwawuvagowe.weebly.com/uploads/1/3/4/4/134496439/fetaxirikukanovos.pdfIn PDF document text
    • https://vugesajovor.weebly.com/uploads/1/3/4/2/134265649/9ba305bcbd8.pdfIn PDF document text
    • https://nosuxiseliv.weebly.com/uploads/1/3/4/5/134578333/5fe54bef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380675/normal_5f91fd9bc7890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_5f934b3e3c40d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391611/normal_5f9b75e2ada1d.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/0d01931d-d7a0-428a-ada4-75cb2592cdcf/92780197319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b8c781a-c416-4b08-b6b5-1e41e91469cd/fizofepapaxerisepusazimam.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_off0000625b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x625B 4980 bytes
SHA-256: 72662b0a2398d24856949110ef01da8b7036fcce22ae6dfd15fae04a79895a7f
font_01_sfnt_off0000732f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x732F 10024 bytes
SHA-256: 1cf04dcfd401fbd4529187776ac495483e69d21d557f7e8e3c042e34852e17ea

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