MALICIOUS
152
Risk Score
Malware Insights
MITRE ATT&CK
T1566.002 Spearphishing Attachment
T1204.002 Malicious Link
The PDF contains a link to a redirector, which is a common tactic for distributing malware or phishing pages. The document body, though malformed, contains text related to a textbook download, suggesting a lure. The presence of numerous external links, many pointing to PDF files hosted on static.usrfiles.com, indicates a link farm designed to attract traffic, likely for malicious purposes. The ML classifier strongly supports the malicious verdict.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 4
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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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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.cc/wix?keyword=sherwood+fundamentals+of+human+physiology+pdf+download
- https://static.usrfiles.com/ugd/b8c837_a8f2906ae8a04caa8d393c15974df4cc.pdf
- https://static.usrfiles.com/ugd/b91566_baef45807e5940679985391044181260.pdf
- https://static.usrfiles.com/ugd/b8c837_f36935d220e1433e9046aa06795b78b8.pdf
- https://static.usrfiles.com/ugd/ace02d_5cbe82f96d7f41ccaf676439c236ea08.pdf
- https://static.usrfiles.com/ugd/b8c837_70961a14e05f4d12a2d9443d7faf2da3.pdf
- https://static.usrfiles.com/ugd/b8c837_e97a4c2bb7ae48c3aba4fe4fdf46d109.pdf
- https://static.usrfiles.com/ugd/b8c837_fe522e3589b548c8a71564471d40eba4.pdf
- https://static.usrfiles.com/ugd/b8c837_6f843f2230d04802a9bf72260ef7aaef.pdf
- https://static.usrfiles.com/ugd/b8c837_d41fd1c364a34d419bdf193ae9978d5f.pdf
- https://static.usrfiles.com/ugd/b8c837_9a2a4ab32b8341d4a2172f6311bc9e59.pdf
- https://cdn.shopify.com/s/files/1/0437/9328/5277/files/wexuj.pdf
- https://cdn.shopify.com/s/files/1/0430/3123/2674/files/aisc_steel_construction_manual.pdf
- https://cdn.shopify.com/s/files/1/0430/5793/8581/files/misakopudotefuzepuwujodez.pdf
- https://cdn.shopify.com/s/files/1/0434/8579/0358/files/free_spanish_color_worksheets.pdf
- https://cdn.shopify.com/s/files/1/0434/2808/5912/files/71870090758.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
Extracted artifacts 2
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
font_00_sfnt_off00006114.binff4d18054849b317be0dd9ed5d5d784926462167a2e65ce96ef1c7ca22020c97 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x6114 | 5752 bytes |
font_01_sfnt_off00007495.bin94a12fdfc314f2f5ec48326100e4cca06a39f09ebbae8b72d71955ab4cc886aa |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x7495 | 9968 bytes |
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