PDF malware analysis — malicious · b367b579522068d1

MALICIOUS

PDF

44.3 KB Created: 2020-09-01 01:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f00803760bd320c2f2bedf0d4c530f5a SHA-1: 2024bca4a22b49a04aaf7a8c6c1ec49ddcf338df SHA-256: b367b579522068d1bd69292bdef56b24319fba49aa7433873edf6996412fee91

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to static.usrfiles.com, which is indicative of a link farm. One prominent link, https://ttraff.com/wix?keyword=hungry+shark+evolution+apk+mod+latest, suggests a lure for users searching for software. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to potentially harmful 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.com/wix?keyword=hungry+shark+evolution+apk+mod+latest
- https://static.usrfiles.com/ugd/b8c837_b333c4d086224df4b36d7181bd313ca5.pdf
- https://static.usrfiles.com/ugd/b8c837_fdfa90182a5d4bc28e25f13ed5d7ec77.pdf
- https://static.usrfiles.com/ugd/6cfc61_29f607e3b30448c2baac72a2e4ec94a6.pdf
- https://static.usrfiles.com/ugd/6f58fb_8638b82611124d55b1a036f249f8e10f.pdf
- https://static.usrfiles.com/ugd/30e015_eb0721b375ba46f68bd6b94b9bc1922e.pdf
- https://static.usrfiles.com/ugd/0d089b_ae750fd4c5724e9194ead1ed2a17b728.pdf
- https://static.usrfiles.com/ugd/5cf23b_a52b2908a294455bb92d0e5324814dd5.pdf
- https://static.usrfiles.com/ugd/b8c837_3209c11817454c42a95375fe3333f0bc.pdf
- https://static.usrfiles.com/ugd/b8c837_01f2fd2444b2434586ba0b0969919ead.pdf
- https://static.usrfiles.com/ugd/b8c837_e91ff4138f344b0bbd5ffb5a6cf491fe.pdf
- https://cdn.shopify.com/s/files/1/0436/2518/5442/files/setixa.pdf
- https://cdn.shopify.com/s/files/1/0431/6990/6854/files/dutikuzoguso.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_off000069c8.bin` `6fc74047dc6d7932997d295762ef949b79b347bb5a30fe09450a90f167287bf6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x69C8	5560 bytes
`font_01_sfnt_off00007c91.bin` `bd5190066b4ffe02ad82a774e739e141a05ce05b5e430827ebf0c0eac9ef49d1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7C91	12408 bytes

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