PDF malware analysis — malicious · 73089c471724a179

MALICIOUS

PDF

40.2 KB Created: 2020-08-30 10:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 9a4f2bd5ff608888e3a0191aa110a43a SHA-1: d7af22667cdc3a1c87911d156815ddddfcaf7da5 SHA-256: 73089c471724a17912df90651bbfd5a091fde234aa889bd71fae09d76ea939bf

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link disguised as a 'physical therapy tool kit' that redirects to a known malicious URL. This suggests a phishing or scam attempt, likely delivered as a spearphishing attachment. The ML classifier strongly supports the malicious verdict, and the presence of numerous external links indicates a link farm or redirector strategy.

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.cc/wix?keyword=physical+therapy+tool+kit
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/ea5d7b_3a22f3ebc22e453894389a5ab891d71d.pdf
- https://static.usrfiles.com/ugd/eaf48f_e0c1c69f44d143dbb6a273cec0ccb78e.pdf
- https://static.usrfiles.com/ugd/857e61_24dc90fdc7624e01ae6feb7fa3a5457f.pdf
- https://static.usrfiles.com/ugd/cf14a4_10605f59a37449d18feca3409b0b9a20.pdf
- https://static.usrfiles.com/ugd/4826f5_4fed666af3cb4648afbef0c1019e7afa.pdf
- https://static.usrfiles.com/ugd/c7ef1a_0b533858d82241fa85aeea8593218e4b.pdf
- https://static.usrfiles.com/ugd/b8c837_18c05589e98249d5b60f135543a901ba.pdf
- https://static.usrfiles.com/ugd/538d67_fa6f2afbcae149249ad3ae12316da88c.pdf
- https://static.usrfiles.com/ugd/c068f8_572caef8e6cd47be9ddbb8745d084f4d.pdf
- https://static.usrfiles.com/ugd/b8c837_1aaf54222abf48b4ba16555518336cbf.pdf
- https://cdn.shopify.com/s/files/1/0448/4546/5762/files/ap_stylebook_2020_free.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4952854333.pdf
- https://cdn.shopify.com/s/files/1/0431/5388/3293/files/95079136644.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006001.bin` `b8158841e62a6e527f339ec65d210c8a9fbb0b3b543c0f501a6ca3666b9e4679`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6001	5188 bytes
`font_01_sfnt_off00007195.bin` `aed9187ab009aff8c4891e46f66d41d4c0ec2b7f3c0af6100b461d99c588503a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7195	10176 bytes

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