PDF malware analysis — malicious · fcf36cb4da14ea4c

MALICIOUS

PDF

41.3 KB Created: 2020-08-29 05:39:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c808d159929ceacab19511ff8ed092d4 SHA-1: 76e2a48f46cdb552bd825325ab6c8d610ab62433 SHA-256: fcf36cb4da14ea4ca1e10901aa8a3e942b535fe455dfac81e80fbe1ec7103ba8

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'yks tarih soru bankasi indir' (YKS history question bank download), suggesting a lure. The primary malicious IOC is the redirector URL, which is likely used to host or chain to further malicious 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=yks+tarih+soru+bankas%25C4%25B1+indir
- https://static.u
- https://static.usrfiles.com/ugd/b8c837_9756cd132ce34c6e8b7e9d053dcd4348.pdf
- https://static.usrfiles.com/ugd/b8c837_857fd19f984e4c0fa702c7e3211b0246.pdf
- https://static.usrfiles.com/ugd/b8c837_9bf2a377745d4bbfa8497477ba07b7ce.pdf
- https://static.usrfiles.com/ugd/b8c837_9ed621cae4ff4374b95ba5c56f3b0acf.pdf
- https://static.usrfiles.com/ugd/b8c837_3df649c4ffdc4755ad0877157f347219.pdf
- https://static.usrfiles.com/ugd/b8c837_549c9876e97844ce934c9dd34441b7b0.pdf
- https://static.usrfiles.com/ugd/b8c837_ad319baeaa3f4a14b46fe1e02621a7ea.pdf
- https://static.usrfiles.com/ugd/b8c837_f08d4455223d4501a91f53f91d3fba49.pdf
- https://static.usrfiles.com/ugd/b8c837_d4e704b806b04769b2819c20efdb9da9.pdf
- https://static.usrfiles.com/ugd/b8c837_f1b61cac9a5840e28a33b0f2c9cb3e85.pdf
- https://static.usrfiles.com/ugd/b8c837_732dba4cd66547b6985d65152bbeb354.pdf
- https://cdn.shopify.com/s/files/1/0429/7854/1722/files/lirejadirapo.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90841244024.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_off0000604c.bin` `14b6258d07fb885a513de2605aed1577dc673aec8dc3354c3057a50679968d98`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x604C	5080 bytes
`font_01_sfnt_off00007181.bin` `f73dc94f54e21950c81b4941980b9d5c0efbd4a431f47916edce01fba6888e27`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7181	11668 bytes

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