PDF malware analysis — malicious · 15ae8e37cebc39fa

MALICIOUS

PDF

34.3 KB Created: 2020-08-29 18:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: fad330e36ad9c5df246a8cfc31712f1c SHA-1: b47614600fff1ee2a15c55db7a96af8a6026c957 SHA-256: 15ae8e37cebc39fa47ba4a91b27e08bf8c4dd5999c7f23c27ee39f3d61cd8fbe

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to a URL associated with malicious infrastructure. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many pointing to benign Shopify domains but one leading to a known malicious redirector. The ML classifier also 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.me/wix?keyword=curso+de+corte+y+confeccion+pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0432/5687/3128/files/vazeki.pdf
- https://cdn.shopify.com/s/files/1/0432/5376/0160/files/upstream_b2_plus_student_s_book_answers.pdf
- https://cdn.shopify.com/s/files/1/0438/2598/7734/files/74347171027.pdf
- https://static.usrfiles.com/ugd/b8c837_c7e4fed6a1414531bd4851100916ddb1.pdf
- https://static.usrfiles.com/ugd/b8c837_79a4e57205f04ba58e0393a2ba477be0.pdf
- https://cdn.shopify.com/s/files/1/0434/0521/3846/files/kajabizenapinaxu.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gujogu.pdf
- https://static.usrfiles.com/ugd/cc03df_06a29af1ca1a41fc8cd45e7d0fed40e2.pdf
- https://static.usrfiles.com/ugd/dc8a8e_6560ea2242c847299218e3eede0dfdf7.pdf
- https://static.usrfiles.com/ugd/565485_a086c0afc2c14387a7090ba4f6739a0d.pdf
- https://static.usrfiles.com/ugd/dd4472_6ed147ef84a949e28e33aa59224a9d97.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_off000047a5.bin` `5c3d729ddb646881b4845b95704c7c3d806e0f8b17f6a6d9a5f5220e7525b284`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x47A5	4916 bytes
`font_01_sfnt_off00005873.bin` `c7bc8624aad272f898b2d6e9011f2daf38a5651d972bc970d1c2112eb9544c9b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5873	10620 bytes

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