PDF malware analysis — malicious · ecce622531613469

MALICIOUS

PDF

40.8 KB Created: 2020-08-29 20:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 2499f9cf532450df7ef299a53ac2f7a3 SHA-1: 094e1b8a131ef104ae5260b420df4f107a89e080 SHA-256: ecce622531613469ca281b3091b8d7b120b47660535709ec09c012d792ab038d

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to malicious infrastructure, disguised with a seemingly innocuous keyword. The PDF also features a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to 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.link/wix?keyword=drumline+movie+questions+answers
- https://static.usrfiles.com/ugd/64d889_be3e3279059845a2a1fe2d48048b0d01.pdf
- https://static.usrfiles.com/ugd/b8c837_6366f00460ca466b9f98981ffee03785.pdf
- https://static.usrfiles.com/ugd/b8c837_12cdad824b15451aa7f3ac4998643da9.pdf
- https://static.usrfiles.com/ugd/b8c837_62918db86f814b9ab2c56ab61585f3c0.pdf
- https://static.usrfiles.com/ugd/b8c837_bd07e64e78e742bd9d6d4af57451afde.pdf
- https://static.usrfiles.com/ugd/b8c837_dbd9e75d778640b4b357b5f909b12d62.pdf
- https://static.usrfiles.com/ugd/b8c837_941a267a2d6b460f93fc17b5f551428b.pdf
- https://static.usrfiles.com/ugd/b8c837_bc4811e10edb45acbd096aa9428404c1.pdf
- https://static.usrfiles.com/ugd/b8c837_eab1f5ba57d3473eb3ce059b61ccb77c.pdf
- https://static.usrfiles.com/ugd/b8c837_bcd83d7e36df4569834cf49203f6545c.pdf
- https://static.usrfiles.com/ugd/b8c837_2fd757cb0e90442f996a960c16712c9d.pdf
- https://static.usrfiles.com/ugd/b8c837_21cd1a1bc45d4a549ae9719109255894.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_off000061ed.bin` `51341ed5fed71344ab76497f94716344594fd9c85014e71cccd0f8436c6e3836`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x61ED	5108 bytes
`font_01_sfnt_off0000734c.bin` `dfd8630c2c8cd1a9e1babe26ef6d67ca799da25e81dd0b72376d15f4899b4568`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x734C	10568 bytes

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