MALICIOUS
194
Risk Score
Malware Insights
MITRE ATT&CK
T1566.002 Spearphishing Attachment
T1059.001 PowerShell
The PDF contains a large number of embedded links, many of which point to external websites, indicating a link farm or redirection scheme. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, suggests a lure related to a 'microbial biotechnology textbook pdf'.
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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Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINKPDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
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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://ttraff.ru/wb?keyword=microbial%20biotechnology%20textbook%20pdf In PDF document text
- http://files.bryantowich.com/uploads/1/3/1/8/131857112/6f6b902a3175a.pdfIn PDF document text
- http://files.bbsimon.com/uploads/1/3/2/6/132682570/tudijimavu.pdfIn PDF document text
- http://files.bambooartscenter.com/uploads/1/3/1/8/131857071/pujeriwetid-napofemerumaw.pdfIn PDF document text
- http://files.michaelpachelo.com/uploads/1/3/0/8/130814340/jibekinejezireluga.pdfIn PDF document text
- http://files.connoisseurstours.com/uploads/1/3/1/8/131857071/abaa266e7dc9a.pdfIn PDF document text
- http://files.communitychurchofkeystoneheights.org/uploads/1/3/0/7/130775859/7249462.pdfIn PDF document text
- http://files.happiervalley.com/uploads/1/3/2/6/132681212/voboduwamesopagesi.pdfIn PDF document text
- http://files.eastafricanscholarsfund.org/uploads/1/3/0/7/130776718/vemofuva.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://tuwomime.files.wordpress.com/2020/07/sureta.pdfIn PDF document text
- https://mevowavam.files.wordpress.com/2020/07/32598605940.pdfIn PDF document text
- https://fiwojinugir.files.wordpress.com/2020/06/berulitosesamezopasafelo.pdfIn PDF document text
- https://vokizowonaso.files.wordpress.com/2020/06/vemowajutuzuboboxalenilo.pdfIn PDF document text
- https://wekusov.files.wordpress.com/2020/06/44719013854.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0428/5143/4659/files/68529755748.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kekesapenogetiru.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685258811.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0427/9389/4044/files/6036130603.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vemuvuferakodumi.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0431/0528/8352/files/fuzijewupamefapapi.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_off00006d6f.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x6D6F | 5404 bytes |
SHA-256: 9237b512ed107ae5bc324dd71de533a5f724dc3606a75ff0c1cc22d427468727 |
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font_01_sfnt_off00007fc7.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x7FC7 | 9680 bytes |
SHA-256: a37764dce8057144d87e3e5677bf4c74b61070639dd5757a9d8f57a0a5827a71 |
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