PDF malware analysis — malicious · 4880416a845f23b4

MALICIOUS

PDF

38.1 KB Created: 2020-08-29 04:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f9deed4ae3235a8c4d941e2b67a329de SHA-1: c75771fd151f773fa35e8f46c7866e0841aa25ce SHA-256: 4880416a845f23b4c7394790a409d4bc05aafb56dc1156ac3eeac1755787638f

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=descarga+de+musica+qnet'. Additionally, it features a link farm with numerous external PDF links, many hosted on 'static.usrfiles.com', suggesting an attempt to manipulate search engine results or distribute further malicious content. The document body contains garbled text and the authoring application 'wkhtmltopdf', indicating it was likely generated programmatically for malicious purposes.

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.ru/wix?keyword=descarga+de+musica+qnet
- https://static.usrfiles.com/ugd/b8c837_092c9ad2c01148cd988c6225a5f241e1.pdf
- https://static.usrfiles.com/ugd/b8c837_495b255cf0bb4d7cac6070c91c4eddff.pdf
- https://static.usrfiles.com/ugd/b8c837_d60a498265e24d389fd958850a23d40f.pdf
- https://static.usrfiles.com/ugd/b8c837_40427c1de91b472eb12c545b3c415cf4.pdf
- https://cdn.shopify.com/s/files/1/0443/6351/4012/files/phylum_rhizopoda.pdf
- https://static.usrfiles.com/ugd/b8c837_5b0760ebcf8242cf9a594d4b66f2709a.pdf
- https://static.usrfiles.com/ugd/b8c837_2953501efc5942719788c1f851e7c787.pdf
- https://static.usrfiles.com/ugd/b8c837_0a4efbfdb90b458abc7854d09df9785c.pdf
- https://static.usrfiles.com/ugd/b8c837_f6870e46963c409fb85b4320f2f66eb2.pdf
- https://static.usrfiles.com/ugd/b8c837_4b528761116b4293acba7c73bf157c71.pdf
- https://static.usrfiles.com/ugd/b8c837_473943440a764100b3342c0fbc9bb6af.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_off000052a5.bin` `7e3f0c2e2d97b47a6b971af7eebdf6bc5dc992d16d27002232b22cafaefaa064`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x52A5	5352 bytes
`font_01_sfnt_off000064b3.bin` `da433ba2158ddfaa7867c6eac354050384f9a43fc3127eda076a937498f79252`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64B3	11620 bytes

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