PDF malware analysis — malicious · 7a0d6b36405c28e6

MALICIOUS

PDF

36.0 KB Created: 2020-09-02 04:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d169e4b02268657e5b4ff10d743b24d8 SHA-1: 3ab72787ed5885d32395e5fb49f399b13073129c SHA-256: 7a0d6b36405c28e6e1db2721bf01183897c432fbe82826bcf576d50b23cd18f1

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to a 'clearance sale'. The document body, though heavily obfuscated, also contains the same redirector URL and a large number of links to external PDFs, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious.

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=egyptian+cotton+sheets+clearance+sale
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/accd1f_b2ac0336d35a4249a15b566192b48fe3.pdf
- https://static.usrfiles.com/ugd/b8c837_60427313b8fc48bea578d7add9820f02.pdf
- https://static.usrfiles.com/ugd/575fb0_6d5250b24f3c4440b4ba609ddab93723.pdf
- https://static.usrfiles.com/ugd/b8c837_89c355524e0a43f080341988eaf0d24b.pdf
- https://static.usrfiles.com/ugd/b7082a_351ec44530974f248b8987a4bec08131.pdf
- https://static.usrfiles.com/ugd/f1d680_7b0245ae68c648959e945f2f7b000f61.pdf
- https://static.usrfiles.com/ugd/370b54_fc0a786e7f0c4d9395ce50776a3ec93c.pdf
- https://static.usrfiles.com/ugd/93971e_06f53fea3c204efeb99087ff304ce688.pdf
- https://static.usrfiles.com/ugd/ce0e6d_799edaeb5ffe4347847670dec1b7d358.pdf
- https://static.usrfiles.com/ugd/0aab01_5bb21bd1ade74b5caba7c580546fe6b6.pdf
- https://static.usrfiles.com/ugd/b11f6d_b0d8e073d72c4f2ca56edf364fa2b93e.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_off00004e94.bin` `d7aac07e2d8a7c0e112a1f58f282934bc54a82a89522a6f8f072a59154047176`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4E94	5252 bytes
`font_01_sfnt_off0000607e.bin` `d63b1b2c0b41809fa0bc0f3a0b4a0b514b48588731e700833328df163e7ccbae`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x607E	10244 bytes

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