PDF malware analysis — malicious · 38cd463d622f040a

MALICIOUS

PDF

50.5 KB Created: 2020-09-05 00:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1d3c256f990d9388a9d9c9ca7f1b6392 SHA-1: 3aaf416a0ec2ae57f681d19b0cf4d5e4c7bf5817 SHA-256: 38cd463d622f040a73ef4bd77e3443a90607051e16281ca70847a0d0cc3b6a01

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that redirect to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to audio interface manuals. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which is likely used to serve further malicious 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.club/pify?keyword=behringer+audio+interface+umc22+manual
- https://static.usrfiles.com/ugd/7cefa9_de10c80f50164fbe8b885eb997b41106.pdf
- https://static.usrfiles.com/ugd/739437_ce28cf591a594f1eab14a446e69597bb.pdf
- https://static.usrfiles.com/ugd/035627_6c50d44619ed4702b30a2084e4a456c6.pdf
- https://static.usrfiles.com/ugd/b8c837_2a2e8e66c18a498cbc81d98abc945bcc.pdf
- https://static.usrfiles.com/ugd/685707_e09f5f2434de4a6696acf8b02d013b08.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/64989875230.pdf
- https://cdn.shopify.com/s/files/1/0428/2092/7655/files/ruxegunagabe.pdf
- https://static.usrfiles.com/ugd/eb4c03_fdf0090fa7ab46168ae5983129fac5ed.pdf
- https://static.usrfiles.com/ugd/b8c837_09a1505ba1864445ae4780b5e3ee6aca.pdf
- https://static.usrfiles.com/ugd/ebbcbd_8507106e83234b9fa278ce6af1eb1b7b.pdf
- https://static.usrfiles.com/ugd/120874_1ba6655f6f6840e0ba26d26481c38a56.pdf
- https://static.usrfiles.com/ugd/5c7528_6f62d349cb86465883818891ddbf73de.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_off000086bb.bin` `a5e74f259721faa89dab0cb15fa4aa5876995fe1a243d1965479cada7352ebf8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x86BB	5440 bytes
`font_01_sfnt_off00009919.bin` `0ed12e130b9b5f17fc97c5bf4de4fcd5c7192a8e9ec34907a1555bf661357074`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9919	10644 bytes

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