PDF malware analysis — malicious · e927e4b4ab78d926

MALICIOUS

PDF

34.5 KB Created: 2020-09-02 19:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1d0463b7af3fb80fa961b6696cd43805 SHA-1: 04380f794406e78032aabfc330cf05d4a517c72e SHA-256: e927e4b4ab78d92609f99ef7955ffb8255de8604abc8504032fc53d6d12fe743

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically disguised as a search result for "Klavier rammstein piano sheet". The ML classifier strongly indicated maliciousness, and the PDF was flagged for linking to known malicious redirectors. No scripts were extracted, but the embedded URLs and the nature of the PDF structure suggest a social engineering lure to drive traffic to a malicious site.

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.link/wix?keyword=klavier+rammstein+piano+sheet
- https://static.usrfiles.com/ugd/4dd980_87943158d894470bb2a762536962fe2b.pdf
- https://static.usrfiles.com/ugd/5fd5c1_5e31a9a1a5754594beef20b9211e50f0.pdf
- https://static.usrfiles.com/ugd/a18aa6_f57cfc6ab71a45ffa55d184acb1df6b3.pdf
- https://static.usrfiles.com/ugd/91e123_231eb08e2b1042258f73f14d91659793.pdf
- https://static.usrfiles.com/ugd/6cf392_95df29df471d49c798bcd52b19987851.pdf
- https://cdn.shopify.com/s/files/1/0435/3985/7572/files/57701806985.pdf
- https://cdn.shopify.com/s/files/1/0464/3264/9368/files/teatv_windows_7.pdf
- https://static.usrfiles.com/ugd/dc8a8e_a1fe653456a14441ad8bb3fa610e4fee.pdf
- https://static.usrfiles.com/ugd/b8c837_ef2b933a735040d496d20ab50877c2cd.pdf
- https://static.usrfiles.com/ugd/b8c837_8966cdd46d774439b8575ae65da3d8bf.pdf
- https://static.usrfiles.com/ugd/b8c837_729d092be7254e4cacead38842b70740.pdf
- https://static.usrfiles.com/ugd/062c90_1856ec02ec1445a1a8fb20ddca1fbe60.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_off00004978.bin` `9cf45f486053b62298b85e189718a55f2865587574423dc2f26d65329b4ae9ed`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4978	5088 bytes
`font_01_sfnt_off00005aa2.bin` `dcb2a39c7abdcea0baa4522bf41307b459125535a51dff69a08f175609f31ef3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5AA2	10204 bytes

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