PDF malware analysis — malicious · cdd895502bd3215e

MALICIOUS

PDF

39.5 KB Created: 2020-08-29 16:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f09c5b41441365c2ade285b0f76e32d9 SHA-1: 7aa6022af2b569185325f0e4e7ca245b75a4e50a SHA-256: cdd895502bd3215e91b36508585754d3c389a7f7a176dcf8eb5bd7d965adbca5

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and keywords suggesting a lure for users interested in Excel VBA programming. This indicates an attempt to redirect users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted from this sample.

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/wix?keyword=excel+vba+programming+for+dummies
- https://static.usrfiles.com/ugd/b8c837_0202632f4e124db693db91f62f856c52.pdf
- https://static.usrfiles.com/ugd/b8c837_7e02755ea7f64cb2ba3cd4a7f15fa134.pdf
- https://static.usrfiles.com/ugd/b8c837_8e8dc1c3d41843349c66fd4d5ca0aa5b.pdf
- https://static.usrfiles.com/ugd/b8c837_c61a0aee4fac4d42a7e57be25f962646.pdf
- https://static.usrfiles.com/ugd/b8c837_4a625bdb0bbc4245b356fa1e0d79689b.pdf
- https://static.usrfiles.com/ugd/b8c837_8318da0f91d143988cc5807b447c2c30.pdf
- https://static.usrfiles.com/ugd/b8c837_54b7dcf7a2be4aa09672ee1cf0f27ae1.pdf
- https://static.usrfiles.com/ugd/b8c837_fd3aa7ddd1d54a7f93fccc8d5cfc3341.pdf
- https://cdn.shopify.com/s/files/1/0437/5497/9477/files/volapizelomebevive.pdf
- https://cdn.shopify.com/s/files/1/0433/3505/7559/files/sirs_dan_sepsis_adalah.pdf
- https://cdn.shopify.com/s/files/1/0432/9806/2501/files/67615865747.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuvekalododit.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_off00005c45.bin` `bee9488d698d27d1b7eb453df576a99ef4e06c83b5c0ea5951cbcd7ec8c80d2b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5C45	5700 bytes
`font_01_sfnt_off00006f97.bin` `b7914b5f4d1bdc194cac58aae96e860b2531907ded39f7baf2035d6c9bc0d74c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6F97	9932 bytes

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