PDF malware analysis — malicious · 71266982d67b721d

MALICIOUS

PDF

40.0 KB Created: 2020-09-11 17:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 01b27207fab958b19190fae5abf7c485 SHA-1: 78a44177a9e02c499c59cdef87f936a41c4ccda5 SHA-256: 71266982d67b721d0ce22c03bfcb42a529d337b449259aefc6ff65802e54235c

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically a URL disguised as a classical sheet music store. The presence of numerous external PDF links, many pointing to Shopify and static user file hosting, suggests a tactic to obscure the ultimate destination and potentially leverage SEO for distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially 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=classical+sheet+music+online+store
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0430/6495/0938/files/serififufufexomepi.pdf
- https://cdn.shopify.com/s/files/1/0455/6242/9605/files/dress_code_formal_wedding_uk.pdf
- https://cdn.shopify.com/s/files/1/0436/2164/6498/files/avant_browser_free_for_xp.pdf
- https://static.usrfiles.com/ugd/bf0735_2e3d18c25b5f4fee8e1f4e07ac7644a0.pdf
- https://static.usrfiles.com/ugd/50c35f_17b1ac30019449d09c7c824ad12cea75.pdf
- https://static.usrfiles.com/ugd/696117_6ef5f0ee00e4406f92feea8472ba9716.pdf
- https://cdn.shopify.com/s/files/1/0428/8882/2950/files/vexodarakubas.pdf
- https://cdn.shopify.com/s/files/1/0429/8421/0583/files/surprise_arizona_zip_codes.pdf
- https://static.usrfiles.com/ugd/ee6770_418d44c7f04140ebab4292b7d5145154.pdf
- https://static.usrfiles.com/ugd/b8c837_25d91c7bdb5b46f9a90f6ebb338b124c.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006021.bin` `b1651f15c9572ec77c4fe639f03e5add7adb112d4ee8f822b79c1a1f8204f89f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6021	4944 bytes
`font_01_sfnt_off000070bc.bin` `d19b9486bdb4f50c64a4f0d08e759ebd235b4ca3078a2e41a2829e30da47fda0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x70BC	10188 bytes

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