PDF malware analysis — malicious · 359b9cb60c39043e

MALICIOUS

PDF

41.1 KB Created: 2020-08-31 01:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ef4debe10b8899185a85062fd5c38b31 SHA-1: 00d27ebc6e116cc707737105e80b785058d6ad9b SHA-256: 359b9cb60c39043e398de26f777ca92fe2f35942a86d846cc6b20baacd9e562b

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.link/wix?keyword=star+reading+test+practice+grade+4, which is also listed as a malicious redirector. The presence of numerous other PDF links, many pointing to static.usrfiles.com, suggests a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=star+reading+test+practice+grade+4
- https://static.usrfiles.com/ugd/5899d5_8667de09273949239a444d8a9e1332da.pdf
- https://static.usrfiles.com/ugd/24853a_c16916c3ea5b41a2bd82a2334f5a6a91.pdf
- https://static.usrfiles.com/ugd/b8c837_2fcc576ca8564adf9185efd0e838529a.pdf
- https://cdn.shopify.com/s/files/1/0438/2133/4688/files/tigudoragegavezusub.pdf
- https://static.usrfiles.com/ugd/63d3ad_d4a74ea7b87949649b4a0fa8788d0e5f.pdf
- https://static.usrfiles.com/ugd/b8c837_042ded1c11234268b377a95cc34b3e07.pdf
- https://static.usrfiles.com/ugd/ce14f3_2bc5659c438b4bbf9dc761648b7269e7.pdf
- https://static.usrfiles.com/ugd/b8c837_c1c1b08528504a6386fbecff564c815f.pdf
- https://static.usrfiles.com/ugd/a18aa6_ebf5909b90934ef1afaef56a1c6c4782.pdf
- https://static.usrfiles.com/ugd/e2c250_108c053debfd475682147893b6b4ede8.pdf
- https://static.usrfiles.com/ugd/b8c837_2178fc3e576e45d3806a5c0956ce27b2.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_off000062b8.bin` `bc545abe7eb89288fa29e4792d8ce90d71023bc0adae6d628aea28fb5d99c8a8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x62B8	5400 bytes
`font_01_sfnt_off00007521.bin` `578b74ff02a326589264321cd37bc7be59da4e879af4ac11b449ea56300609d6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7521	10360 bytes

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