PDF malware analysis — malicious · 2b1f53a0713758d0

MALICIOUS

PDF

33.2 KB Created: 2020-08-30 13:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1a1e5c40031d68ce4f5964bd5b95f939 SHA-1: 4cf071f3dd452a2c66f1a61a4695ecf1e410da9a SHA-256: 2b1f53a0713758d09e7467578da83babb2557abbd04c56a20cc6d230c3cafed8

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wix?keyword=arya+telugu+movie+full+hd, which is likely intended to trick users into clicking it. The presence of numerous links to static.usrfiles.com suggests a link farm for SEO manipulation or traffic redirection. The ML classifier strongly flagged this PDF as malicious.

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=arya+telugu+movie+full+hd
- https://static.usrfiles.com/ugd/7f46b5_34076d7a67054e31acaf17a2ce4edd89.pdf
- https://static.usrfiles.com/ugd/576447_0047d7140c534b26b08ac53c860b71a9.pdf
- https://static.usrfiles.com/ugd/b8c837_6aa831ffa1ee41eca5ec82483d40b280.pdf
- https://static.usrfiles.com/ugd/b8c837_cc71f22b4e5b4f298e5c14a51542fe7a.pdf
- https://cdn.shopify.com/s/files/1/0437/9328/5277/files/nemib.pdf
- https://cdn.shopify.com/s/files/1/0433/1687/1326/files/liwixo.pdf
- https://cdn.shopify.com/s/files/1/0429/6255/0940/files/65031556372.pdf
- https://cdn.shopify.com/s/files/1/0428/3708/2271/files/17169203143.pdf
- https://cdn.shopify.com/s/files/1/0432/4222/5832/files/37610952289.pdf
- https://cdn.shopify.com/s/files/1/0454/8116/4950/files/carbohydrates_and_diabetes.pdf
- https://static.usrfiles.com/ugd/5fd5c1_59a439cd2dc54ec1a493d8031dbd246d.pdf
- https://static.usrfiles.com/ugd/83e24f_2ab355b7bd3840b4b5c8a85f4069ec24.pdf
- https://static.usrfiles.com/ugd/9dda13_fd1913a08d9f4b86b692636543492a2f.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_off000044be.bin` `fb6eb17f4a5deb4075f54a59984af6904a9ca9514274ac2e2d616fc3374506ad`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x44BE	5296 bytes
`font_01_sfnt_off000056a9.bin` `bb809f37737b5a90f37c016c613464f11a0f59e411c63972e0ae670509112444`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x56A9	9896 bytes

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