PDF malware analysis — malicious · 1abe8ba5af07fcf4

MALICIOUS

PDF

39.7 KB Created: 2020-08-29 18:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: fbb5442030be98083372372420bedf4a SHA-1: f77f78eca3b59198a9a773b5cc52af363fbfd802 SHA-256: 1abe8ba5af07fcf4ac767092d10b7f1460f6c616f59907f9ef793b873300e791

152 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, many of which point to a redirector service (ttraff.ru). This behavior is indicative of a link farm used to obscure malicious destinations or to distribute phishing lures. The ML classifier strongly supports the malicious nature of this PDF.

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=organic+chemistry+7th+edition+soluti
- https://static.usrfiles.com/ugd/b8c837_3b2ba8aee31646b8bd12746a95db0613.pdf
- https://static.usrfiles.com/ugd/b8c837_81f7a9d0b08a4f23aefb4664121db55e.pdf
- https://static.usrfiles.com/ugd/89363e_1f6bfc66118b4ee0bb9eb8b761b2f5eb.pdf
- https://static.usrfiles.com/ugd/5ed537_357bfd1e290149648d17369206ce14cb.pdf
- https://static.usrfiles.com/ugd/73c254_e589c83fe7cb4f908298fa1b5692329f.pdf
- https://cdn.shopify.com/s/files/1/0428/2312/3100/files/61840292138.pdf
- https://static.usrfiles.com/ugd/b8c837_3b5fbe4786ef4768a4884f1ebd64282f.pdf
- https://static.usrfiles.com/ugd/b8c837_e6d5c376767f4cbdaf1b5c0ac0765ec8.pdf
- https://static.usrfiles.com/ugd/078c79_1ae5dab1fdd944c6939fb945880bd71e.pdf
- https://static.usrfiles.com/ugd/b8c837_63f9f500c42244b78287e1844a08accb.pdf
- https://static.usrfiles.com/ugd/b8c837_1c6863ba88144bb3a23b51bf74ff5727.pdf
- https://static.usrfiles.com/ugd/b8c837_96711c4ee1d3412d9f57b6d255b93abe.pdf
- https://static.usrfiles.com/ugd/b8c837_48ef981763f14e7cb887befc3eb6581d.pdf
- https://static.usrfiles.com/ugd/b8c837_b53e9525bd1749be8c2034ce0e38c3fb.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_off00005c37.bin` `f89826723468e91bf2391f48c840838c728f744f0d693f1a0c9dc6c7de86407d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5C37	5560 bytes
`font_01_sfnt_off00006ef8.bin` `414c028a02fb14d10c96335d1f3ff6546687e9b65bdebf53a1cb28e05fab0e4e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6EF8	10320 bytes

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