PDF malware analysis — malicious · 4ed7302b368ca4f2

MALICIOUS

PDF

38.5 KB Created: 2020-09-02 10:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 17225d79d39b636e1b5d5163af5c52ee SHA-1: 691a4d041b1e55b4647c4643fc3dd054cb7bc29d SHA-256: 4ed7302b368ca4f25bc40c3661d82e22fa67b6c1efaf7852798d38282ab784c1

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple critical heuristics as malicious, specifically for containing a redirector link and a link farm. The embedded URL `https://ttraff.link/wix?keyword=burn+piano+sheet+music+easy+with+letters` is a known malicious redirector. The document also contains numerous links to other PDFs hosted on `static.usrfiles.com`, forming a link farm likely intended to manipulate search engine results or distribute 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.link/wix?keyword=burn+piano+sheet+music+easy+with+letters
- https://static.usrfiles.com/ugd/ef7486_64373a71a1834bea8ca9612423de8a3b.pdf
- https://static.usrfiles.com/ugd/1c8c6c_410772c1d87d4fa4bf2a356d0096700f.pdf
- https://static.usrfiles.com/ugd/ea5d7b_807a2df25e884c90a6c6d3b10d2c1958.pdf
- https://cdn.shopify.com/s/files/1/0432/6598/2632/files/23784028079.pdf
- https://cdn.shopify.com/s/files/1/0433/7929/4358/files/rowenta_iron_repairs.pdf
- https://static.usrfiles.com/ugd/6df952_3e42b079214247c0a6c2a1d287417391.pdf
- https://static.usrfiles.com/ugd/fd3290_d53425e3639249d687cd8d454fe79407.pdf
- https://static.usrfiles.com/ugd/d54300_623eeac910074f84bc50d2781fb9d459.pdf
- https://static.usrfiles.com/ugd/911c12_e8d8930b394641d8a39ba3939e69db66.pdf
- https://static.usrfiles.com/ugd/b8c837_aa28568802844c82bf3acaf25de470f5.pdf
- https://static.usrfiles.com/ugd/0df15e_58899d6da9ed440797c062362813ddc8.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_off00004dbe.bin` `049d5a88193406c146671dc8f76283dac33a847254b68e379ddd86f26f2c832f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4DBE	5416 bytes
`font_01_sfnt_off00006013.bin` `916fddc332b2ef1165745f0849f31c180cecf3cbef5b496781c54b6d5f9f7499`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6013	13752 bytes

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