PDF malware analysis — malicious · b7706cc229a15f64

MALICIOUS

PDF

37.0 KB Created: 2020-08-30 04:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 2863429079edbc5e6dc295dc3e8279d6 SHA-1: 0df7776fa47efd25844ceba71777fb96794d1cd6 SHA-256: b7706cc229a15f64ca86d7c0cc30e36b1d61b361902bb8a3876a63fad0dec7f6

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://ttraff.ru/wix?keyword=natt+chanapa+sex', is flagged as a 'PDF_MALICIOUS_REDIRECTOR_LINK'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same suspicious URL, suggesting the primary purpose is to redirect users to 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.ru/wix?keyword=natt+chanapa+sex
- https://static.usrfiles.com/ugd/1f2646_2cef7db7d894404e869cbd24b46da759.pdf
- https://static.usrfiles.com/ugd/b8c837_a38d6fa4cb47484080ed3b800154c22e.pdf
- https://static.usrfiles.com/ugd/b8c837_a0445731655846e8bab94c08dcb1919c.pdf
- https://static.usrfiles.com/ugd/b8c837_7bcc34a0377846cb9b108c067d771ad2.pdf
- https://static.usrfiles.com/ugd/837d34_fe9143322fcf4b20a451bdd5e55ea9ad.pdf
- https://static.usrfiles.com/ugd/b8c837_a77677dbcb4b448a8aa4d3c41675b922.pdf
- https://static.usrfiles.com/ugd/510a18_bf9f046b03814f448cdc410e294a59c8.pdf
- https://static.usrfiles.com/ugd/b8c837_73bd2cffd2074b3da95b4760d81bd000.pdf
- https://static.usrfiles.com/ugd/b8c837_6573bfaeffc24253bee62bc962877ac2.pdf
- https://cdn.shopify.com/s/files/1/0429/7375/7603/files/creative_brochure_design.pdf
- https://cdn.shopify.com/s/files/1/0431/2036/1629/files/lubinizejowa.pdf
- https://static.usrfiles.com/ugd/599f1c_7b0da92befc64aa89a30abf4db47f5ae.pdf
- https://static.usrfiles.com/ugd/b8c837_0dbb8c5f67c64c6e89d56df9f1fa27d9.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_off000051b0.bin` `f90369f8c1b36d2f700cb512ba596514c1d7bfb45a13a5e5d829a6880b9d696f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x51B0	4932 bytes
`font_01_sfnt_off00006278.bin` `5d8341baf6a28d73dabac8f05e630fb904c9b86d20e4af08133e089955d417e0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6278	11136 bytes

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