PDF malware analysis — malicious · c9b896f72b576bea

MALICIOUS

PDF

43.8 KB Created: 2020-09-11 03:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0daf1b715c2d566ddd04b63ffd6c6d8d SHA-1: 6da186922f3008c20f8cfcf3ceaa2f6102000ee3 SHA-256: c9b896f72b576bea6fd7f6614e5e7df08e0d711a936d8dd8f6c2063f76d99de7

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a tactic to manipulate search results or distribute malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body is heavily obfuscated.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF 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.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small 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.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The 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.
Embedded URL info EMBEDDED_URL

One 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.link/pify?keyword=fiche+m%25C3%25A9tier+brancardier+pdf
- https://static.usrfiles.com/ugd/0dcf4b_f122efdefa3e4d958a40cf33750f3d15.pdf
- https://static.usrfiles.com/ugd/9f69bd_d868ae23e8434475a23995efa08b8dc4.pdf
- https://static.usrfiles.com/ugd/bf650e_e613a311d1d64411939e6abea2767a90.pdf
- https://static.usrfiles.com/ugd/cb5dea_c5e4124090a24642b1c85174a8f49930.pdf
- https://static.usrfiles.com/ugd/b65acf_71854563cd4a4f14869d3a89f4b4a602.pdf
- https://static.usrfiles.com/ugd/b8c837_d81b9089030945d886ddd7c35c0b34d2.pdf
- https://static.usrfiles.com/ugd/451a43_2bb553026f2949378d35084836dc7147.pdf
- https://static.usrfiles.com/ugd/913720_ba5168fda6a3476287cea135a4c7c991.pdf
- https://static.usrfiles.com/ugd/3826db_5308b7965c1747b1939b066da78ebb00.pdf
- https://static.usrfiles.com/ugd/136d3d_c5dacbbb79944417bd2c8e31a8a766ce.pdf
- https://static.usrfiles.com/ugd/98e298_2be920e28717423fa0ce8fd2b713fdb1.pdf
- https://static.usrfiles.com/ugd/b8c837_25d561201ff24dad8cd0009667353c79.pdf
- https://static.usrfiles.com/ugd/bbd3cf_c9fa24f3c7a14e709f9179f2323c1209.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_off000069d0.bin` `1c78090d2a178332905daf2d398f514bde9bce112715452ae13e618fbe9987d3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x69D0	5424 bytes
`font_01_sfnt_off00007bcf.bin` `8a9d6a9d4e2dac97babd2584b50d841f14f71acedcabaee1a098c0f847553973`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7BCF	11652 bytes

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