PDF malware analysis — malicious · 06e467559790ae71

MALICIOUS

PDF

52.7 KB Created: 2020-09-02 20:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c53a7201131fd278574f4c62c71c67ca SHA-1: 53bbd0a20dea843c5fc64fc64e6021b79ae08c86 SHA-256: 06e467559790ae712f0061d2b5bbfb21d4fc1a0f10ef3f715a9c54da951531db

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL 'https://ttraff.link/wix?keyword=algebra+equations+notes+pdf'. It also exhibits characteristics of a link farm, with numerous external PDF links. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to disguise malicious activity as educational material.

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/wix?keyword=algebra+equations+notes+pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/158fb9_5f1d6793199f4f3d8da3321031418537.pdf
- https://static.usrfiles.com/ugd/6812d7_0a9b1ab8c4104e5d87abf062b5751f0f.pdf
- https://static.usrfiles.com/ugd/3aee12_c437e4e33bb041c591ab0c4598aab06c.pdf
- https://static.usrfiles.com/ugd/b8c837_3716386159e84bb3a521068b19b856cb.pdf
- https://static.usrfiles.com/ugd/0ebc1f_4acec88601c74d08980b7fae80330e09.pdf
- https://cdn.shopify.com/s/files/1/0437/5648/6807/files/dr_jart_sheet_mask_uk.pdf
- https://static.usrfiles.com/ugd/b8c837_c59f01c313944bd89b6c6d5c60b9c983.pdf
- https://static.usrfiles.com/ugd/83d902_3f044af61e3c41609eef8e3c383dfdf0.pdf
- https://static.usrfiles.com/ugd/b8c837_64f6a900355f40f9beb0e82df5eb9452.pdf
- https://static.usrfiles.com/ugd/6e3131_e76ce17451f646cd9366138c4d2a1b21.pdf
- https://static.usrfiles.com/ugd/77eba6_4ddeffb910c5432c97ea5305cb346fcf.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00008fa0.bin` `70b8b78efbc5b8f55e01f73117442ba8470d5e7980b5b5f1abb40553920fc1c8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8FA0	5464 bytes
`font_01_sfnt_off0000a237.bin` `22deda36e7c1311ad4779d9f6c374fbda0ab9e9483a6e35b33c76740be5fc68e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA237	10476 bytes

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