PDF malware analysis — malicious · f95f254500de981b

MALICIOUS

PDF

45.1 KB Created: 2020-08-30 01:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 15281697b473fb0aebd0b5b0f20ec415 SHA-1: b8a1d6ee8943322e86963ef7f74056974c076e1a SHA-256: f95f254500de981bfa179b430188092a23757fb7232521ca4e29bd76bed42015

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic identified it as a PDF link farm, with many links pointing to static.usrfiles.com, but the primary malicious link is to ttraff.cc, a known redirector. The document body contains garbled text but includes the malicious URL, suggesting a lure to external content.

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.cc/wix?keyword=propiedad+conmutativa+asociativa+y+d
- https://static.usrfiles.com/ugd/b8c837_e81dcfa48751459ab4ed4dbbcf9b34d7.pdf
- https://static.usrfiles.com/ugd/5b5da7_3ce918517d314ed793026671cab6ac38.pdf
- https://static.usrfiles.com/ugd/3b47cb_3e54f80ab44d4f2991c2896d8fa546d9.pdf
- https://static.usrfiles.com/ugd/e73fea_f882e62607024ae7a70b837f1634bc8a.pdf
- https://static.usrfiles.com/ugd/269bb8_beba3de3b1bb412186ce56f6ff0f7864.pdf
- https://static.usrfiles.com/ugd/b8c837_a510631e1bd34398915a53193dc1429b.pdf
- https://static.usrfiles.com/ugd/b8c837_c2073b104cc74ced9fdaba9c8dc72939.pdf
- https://static.usrfiles.com/ugd/b8c837_cf47ea6b1b8442ee9c2bcdc31cafbbe3.pdf
- https://static.usrfiles.com/ugd/b8c837_a656143f4a0e461e9222c9593b639648.pdf
- https://static.usrfiles.com/ugd/89363e_fe4b8f49903c4d5785f467ce60b55f37.pdf
- https://static.usrfiles.com/ugd/b8c837_785771358b144249a8f55fa1d806eb23.pdf
- https://static.usrfiles.com/ugd/b8c837_8b233d4757c540bca3c746b29c17878a.pdf
- https://static.usrfiles.com/ugd/b8c837_4ffec7ef8bf841e1aef717cf53b69edb.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_off00007172.bin` `442763a510eadfee56e468a3d03a33d2dfa89585f7b98eb0c602ef18ada961eb`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7172	5348 bytes
`font_01_sfnt_off00008392.bin` `624225bd7ce676917f8236db7792f880d7f0d2604b9a0f0b91e21f91045f2b30`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8392	11092 bytes

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