MALICIOUS
184
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1204.002 User Execution: Malicious Link
The PDF contains a large number of links to external websites, disguised as lecture notes, which is indicative of an SEO poisoning or link farm attack. One of the primary links, https://cctraff.ru/strik?keyword=ap+calculus+ab+lecture+notes+pdf, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 5
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PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINKPDF 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.
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Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARMSmall 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.
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Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARMSmall 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.
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Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTALThe 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.
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Embedded URL info EMBEDDED_URLOne 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=ap+calculus+ab+lecture+notes+pdf In PDF document text
- https://site-1037246.mozfiles.com/files/1037246/sawitivi.pdfIn PDF document text
- https://site-1038851.mozfiles.com/files/1038851/kupevabixerevivofi.pdfIn PDF document text
- https://site-1039560.mozfiles.com/files/1039560/zosubezigesipuvezutulukur.pdfIn PDF document text
- http://widivewa.bostonbulldogsrunning.com/uploads/1/3/1/4/131408738/d410cc.pdfIn PDF document text
- http://files.newimage.net.au/uploads/1/3/2/8/132815002/pelipaguloxaxite.pdfIn PDF document text
- http://files.paperinvestigator.com/uploads/1/3/0/7/130739154/4e6695bc.pdfIn PDF document text
- http://files.kirstenenglish.com/uploads/1/3/1/4/131452735/f003976af7.pdfIn PDF document text
- http://files.goldenrodgala.org/uploads/1/3/1/3/131383720/bekeri_wumebujuw_bozaxir_powefovuwoneniz.pdfIn PDF document text
- http://files.heartlandfirerescue.com/uploads/1/3/1/6/131606396/3211129.pdfIn PDF document text
- http://files.lifeislikevegetables.com/uploads/1/3/1/3/131384281/lidiki-pumumaborulenuk.pdfIn PDF document text
- http://files.lynettewellmeier.com/uploads/1/3/1/3/131380601/bojevedix_wudapatoboga_retosikepizi_goruku.pdfIn PDF document text
- http://files.designsbymeghan.net/uploads/1/3/1/3/131383813/184286d7bf2.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/b46dabdd-5f52-4b8c-9268-f7608617fdf5/9936390530.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/771e6d55-275f-4b1d-abb8-b82114e3e5cd/9189946339.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/68a2d690-0f8b-450f-94fe-14fc5ca1cc1d/wibaziliserakarog.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.
| Filename | Kind | Source | Size |
|---|---|---|---|
font_00_sfnt_off00007507.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x7507 | 5276 bytes |
SHA-256: a54198a3e8a48615d5d62dd3f2739cf74c2d29750bbd8e0b6f3658db9f9ace6f |
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font_01_sfnt_off000086ff.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x86FF | 9892 bytes |
SHA-256: c03afcb973a1d0768b8a84dac881a2229c2cb2499ce2a94a29468c6ae5808277 |
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