MALICIOUS
152
Risk Score
Malware Insights
MITRE ATT&CK
T1566.002 Spearphishing Attachment
T1059.001 PowerShell
The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of numerous external PDF links, many pointing to static.usrfiles.com, suggests a link farm or SEO poisoning attempt to lure victims.
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=aha+hypertension+guidelines+summary
- https://static.usrfiles.com/ugd/b8c837_349c252372984fe9b3410c02ef022d81.pdf
- https://static.usrfiles.com/ugd/857e61_f15f4394b8a34b6885720b8a6d9d1ee7.pdf
- https://static.usrfiles.com/ugd/b8c837_91d4867ac1f04469b83472b97fd8454e.pdf
- https://static.usrfiles.com/ugd/cb4a18_cb9e4fa82b9640d98e7e3592aae67049.pdf
- https://static.usrfiles.com/ugd/9ea91e_af30374e752a4ab2ba3d28849cbf6ffd.pdf
- https://static.usrfiles.com/ugd/cfa91a_ed3de532cc984fa78aad8236414bffda.pdf
- https://static.usrfiles.com/ugd/fa6f14_0bc43f6e503c468f996f404c32a8ed7b.pdf
- https://static.usrfiles.com/ugd/e73fea_1ba30908dd9f4b4eb3b17cb20043855b.pdf
- https://cdn.shopify.com/s/files/1/0440/1666/4734/files/49955075261.pdf
- https://cdn.shopify.com/s/files/1/0435/5696/2465/files/my_verizon_bill_pay.pdf
- https://static.usrfiles.com/ugd/b8c837_912440e77ed84e83bf6efcd6eb7d9f54.pdf
- https://static.usrfiles.com/ugd/4dd980_d18ea488949f4bbc90c4fd63b69e60f8.pdf
- https://static.usrfiles.com/ugd/58a813_ebbcee5e6d3e4df688ac76b5a4a3d6f6.pdf
- https://static.usrfiles.com/ugd/b8c837_95bde3f0ece449be9e72462082bb8498.pdf
- https://static.usrfiles.com/ugd/de3d83_17618e20dfff4d93a201b2f45d0fb7ca.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_off0000c94b.bin0ce9d766fc9999b70eaff2ca60dd61505db81c4306948a7cb5faeef357fb7310 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xC94B | 5464 bytes |
font_01_sfnt_off0000dbc3.bin5b21e423d32b798afd88a3c1d5907ebb14bd17c2f6fbba2a5e3d7ffeeea20713 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xDBC3 | 13512 bytes |
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