MALICIOUS
154
Risk Score
Malware Insights
MITRE ATT&CK
T1566.002 Spearphishing Attachment
T1059.001 PowerShell
The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=area+where+b+cells+become+immunocomp, which is also listed as a malicious redirector. The presence of numerous other links to static.usrfiles.com suggests a link farm or content delivery network used to host malicious files.
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.ru/wix?keyword=area+where+b+cells+become+immunocomp
- https://static.usrfiles.com/ugd/b8c837_a4d71394db514285b0e877aaeb746780.pdf
- https://static.usrfiles.com/ugd/b8c837_98fe4ef2b21646f48007bab19c207499.pdf
- https://static.usrfiles.com/ugd/b8c837_725639628d584dd48b143e5adc3fa149.pdf
- https://static.usrfiles.com/ugd/b8c837_db80b0e0394b451c86e1fafbd4b6ea36.pdf
- https://static.usrfiles.com/ugd/b8c837_5ac3ee028dd74febb13802a87a7de7f6.pdf
- https://cdn.shopify.com/s/files/1/0437/0461/5066/files/94499512678.pdf
- https://cdn.shopify.com/s/files/1/0462/3607/4133/files/91448660700.pdf
- https://static.usrfiles.com/ugd/b8c837_ffb888ccdff74888b90bfa85a1dd202f.pdf
- https://static.usrfiles.com/ugd/b8c837_538721c2a6c542a3807f4fcdeba1b002.pdf
- https://static.usrfiles.com/ugd/b8c837_8657dfc8d9494d70855fa76bb9c1a0e7.pdf
- https://static.usrfiles.com/ugd/b8c837_baa277f25a374441b94f96ba31ad475b.pdf
- https://static.usrfiles.com/ugd/b8c837_da0e981594ba4776892747714e25d664.pdf
- https://static.usrfiles.com/ugd/b8c837_d08cb33ae5f14941bfc7375b4b153197.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_off0000e5b8.bin9e92420f93f3a602d0d577f9778fcd4319d632edf3bf23b541cdfc0421fc6ae9 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xE5B8 | 5396 bytes |
font_01_sfnt_off0000f7f4.binf1693a99d3963e81aee51e22cff3bf78d55bafcf8e10e9aece451e543188144f |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xF7F4 | 12188 bytes |
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