PDF malware analysis — malicious · f8356da6c2ca3c82

MALICIOUS

PDF

42.7 KB Created: 2020-08-23 10:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f095be2ad550cae4220a58e53a039441 SHA-1: 4020f2b3d95ec2576f7d35a4a4a856d898abe1ad SHA-256: f8356da6c2ca3c82acbd2012acdfa66c55ab9947b601c6046aea1e9a371cd6ed

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, including one pointing to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains the string 'Informational business report template' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful 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.ru/pify?keyword=informational+business+report+template
- http://budobeka.holmesbaptist.org/uploads/1/3/1/4/131406893/jezoxegikezof.pdf
- http://dudevamiv.tonywithers.co.uk/uploads/1/3/2/3/132303189/a88c59.pdf
- http://lujodigo.usc-aed.com/uploads/1/3/1/0/131070374/1b64777c44.pdf
- http://files.caminoarts.org/uploads/1/3/0/8/130874090/1102553.pdf
- https://cdn.shopify.com/s/files/1/0432/4527/3251/files/wibula.pdf
- https://cdn.shopify.com/s/files/1/0439/2127/7096/files/rules_by_cynthia_lord.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasidobedibugamis.pdf
- https://cdn.shopify.com/s/files/1/0432/2567/7982/files/rikuzeku.pdf
- https://cdn.shopify.com/s/files/1/0437/5832/1821/files/3843507261.pdf
- https://cdn.shopify.com/s/files/1/0430/0649/2831/files/99362403366.pdf
- https://cdn.shopify.com/s/files/1/0434/7209/3336/files/fogogavusokuzotetap.pdf
- https://cdn.shopify.com/s/files/1/0429/9502/4033/files/78890698677.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_off00006b15.bin` `5fdd89986df4080ac61365939c46aa8b00fa8eb65a6429882874e9e95739a83a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6B15	5124 bytes
`font_01_sfnt_off00007c60.bin` `f8969a74939dcb9bb215171f1ddde85f1ff31ba9d7d92a4d36c15e7f0d5cbf64`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7C60	9900 bytes

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