MALICIOUS
274
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1059.007 JavaScript
T1203 Exploitation for Client Execution
This PDF file employs a fake CAPTCHA lure to deceive users into clicking on embedded links. These links redirect to a known malicious infrastructure, which then leads to a large collection of SEO-optimized PDF files, likely intended to manipulate search engine results or distribute further malware. The ML classifier strongly indicated maliciousness, and the presence of multiple redirector links reinforces this assessment.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 7
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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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Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LUREPDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
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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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Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHADocument displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
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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/pify?keyword=captcha+solver+software+free In PDF document text
- http://repak.pdcopportunitycenter.org/uploads/1/3/2/8/132814930/7616677.pdfIn PDF document text
- http://files.sarahconnatser.com/uploads/1/3/2/6/132682745/tavusokenapoxix.pdfIn PDF document text
- http://files.palmcoastflautorepair.com/uploads/1/3/2/8/132815054/kuxepetaji-rafojuxefozur-powinuvof-fasagokofefu.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://cdn.shopify.com/s/files/1/0448/0407/9777/files/neuralgia_de_arnold.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53635556436.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0428/5012/3943/files/laputegenukajinif.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0439/2864/9896/files/37010769011.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0429/5042/6787/files/sentence_or_fragment_worksheet_grade_3.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0433/9017/3349/files/little_krishna_flute_ringtone_zedge.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0435/9133/6099/files/java_programming_tutorial_book.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0433/4354/4488/files/makalah_dampak_merokok.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0435/8239/0435/files/31725296568.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0428/8076/2023/files/wogirepafefulexete.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0450/7366/2115/files/hastings_point_tide_guide.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0434/9529/3094/files/causes_of_pneumonia.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 3
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
font_00_sfnt_off00006ce4.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x6CE4 | 5160 bytes |
SHA-256: d45c701cf2bd9d87a51ebd8ea34bb2d51de07de5ecbd926bb672f3edfb3005f6 |
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font_01_sfnt_off00007e82.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x7E82 | 10976 bytes |
SHA-256: 4d46dbc584da4d321197d93ce8276470834dee6b837fad0726774560d61a6a66 |
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font_02_sfnt_off0000a3f6.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xA3F6 | 1740 bytes |
SHA-256: 5f7498f8e433e4c6c47e8ca53e78f46c92ad2660f1d70c8a76bf58ffa4fc47b7 |
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