MALICIOUS
194
Risk Score
Malware Insights
MITRE ATT&CK
T1566.002 Spearphishing Attachment
T1059.001 PowerShell
The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wix?keyword=ap+biology+formula+sheet+2020'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, one of which is 'https://static.usrfiles.com/ugd/3e87bf_f3971f54b1f44fd6b16916d94648c6ad.pdf'. The document body, though heavily obfuscated, contains text related to 'Ap biology formula sheet 2020' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise malicious redirection. The ML classifier also strongly flagged this PDF as malicious.
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.com/wix?keyword=ap+biology+formula+sheet+2020 In PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://static.usrfiles.com/ugd/3e87bf_f3971f54b1f44fd6b16916d94648c6ad.pdfIn PDF document text
- https://static.usrfiles.com/ugd/69695d_d2792f8fef094510ae0eff5482e13d7a.pdfIn PDF document text
- https://static.usrfiles.com/ugd/7d21c0_611b4e557c904cc2a35f17ac9d48a9a3.pdfIn PDF document text
- https://static.usrfiles.com/ugd/f55bec_ef83aaef124943379316f5776568d653.pdfIn PDF document text
- https://static.usrfiles.com/ugd/b5aed9_94270a7bdefb42a780fea59b9270a9c2.pdfIn PDF document text
- https://static.usrfiles.com/ugd/e42ee3_6db14ed8cea8478eb620b78181173ef0.pdfIn PDF document text
- https://static.usrfiles.com/ugd/b8c837_dd478a87a217432d8bf1dbebc761b52b.pdfIn PDF document text
- https://static.usrfiles.com/ugd/1f2646_e609760b83df4590b55f2a22c0abae60.pdfIn PDF document text
- https://static.usrfiles.com/ugd/5be868_7521eaaa36344661afa8c1d37395d5f7.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0428/8839/6959/files/95047003186.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0437/7870/3521/files/hollander_s_interchange_manual.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0434/2549/7250/files/wafewevuletunige.pdfIn PDF document text
- https://static.usrfiles.com/ugd/b8c837_c8a3b5f26b1c43e3b0c78f03e4a0e224.pdfIn PDF document text
- https://static.usrfiles.com/ugd/be19e1_20a05a7a7ba8460a9346f728b997ad83.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
Extracted artifacts 3
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
font_00_sfnt_off000062f6.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x62F6 | 5820 bytes |
SHA-256: 0a50ee757bf9570a7017b4b03cb051cc44986b5e7908e893d6e8280f3594fe21 |
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font_01_sfnt_off000076a5.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x76A5 | 10216 bytes |
SHA-256: 5073805d6952d99dae3566095c9f744c87d2f80d2fa595f4d70d6d599297b8c5 |
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font_02_sfnt_off000099da.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x99DA | 16152 bytes |
SHA-256: 70180b97a9b9fe0de1e0c05b06d733d04658c9f7a2923a3eee6842afe753d47e |
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