PDF malware analysis — malicious · e73c15d4763185c8

MALICIOUS

PDF

77.6 KB Created: 2020-08-29 18:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c9c517bbb1c0a8c5bdae62f86c46e276 SHA-1: ed51c4dd045a8a8950e06d4ecc365cd2a1e11ab2 SHA-256: e73c15d4763185c8f832f9dc3d9133213e8231ab8e945fd368d87b3ee9e8f4fa

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links hosted on static.usrfiles.com, likely intended to obscure the ultimate destination. The primary malicious URL identified is https://ttraff.club/wix?keyword=el+arte+de+amar+tu+cuerpo, which is part of the redirector infrastructure.

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/wix?keyword=el+arte+de+amar+tu+cuerpo
- https://static.usrfiles.com/ugd/dc8a8e_272f8c8bff024887a4ae19fd280d6605.pdf
- https://static.usrfiles.com/ugd/b8c837_2ec6fa03b22d487ca22ac3d8f9f580e4.pdf
- https://static.usrfiles.com/ugd/b8c837_13e024c22b224f67929a160576ea031c.pdf
- https://static.usrfiles.com/ugd/b8c837_fb300e67e18847b8bad37b61f7f30ea1.pdf
- https://static.usrfiles.com/ugd/b8c837_e4f7ac90e6dd4d6b9195487a5d661922.pdf
- https://static.usrfiles.com/ugd/1e32c2_10256b1af383495c884905f745fbb205.pdf
- https://static.usrfiles.com/ugd/b8c837_48d132b8992940a8b6dfd096f1126b78.pdf
- https://static.usrfiles.com/ugd/b8c837_6211cc3996b64d69973a78a16bef9644.pdf
- https://static.usrfiles.com/ugd/0e2875_4e7d7588263e4fabbad4717c500a498c.pdf
- https://static.usrfiles.com/ugd/e73fea_7f34d34b0e77417aa5495ceda5614ef0.pdf
- https://static.usrfiles.com/ugd/f967ac_3842b7313a714922a213828d4c5dbfcf.pdf
- https://static.usrfiles.com/ugd/b8c837_451c69a7ab8d4a5fa28f1bf65de6d96e.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_off0000f035.bin` `d935bd97235e460c5544ae90e005a7e5d4e7b949c4e97c0370d636bae292c3c5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF035	4996 bytes
`font_01_sfnt_off00010112.bin` `e63fada1a05a671093b30d6ba2c55aefe59722608ffea40ec2daff8756169dbc`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10112	11972 bytes

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