PDF malware analysis — malicious · 450a515cad42531f

MALICIOUS

PDF

43.8 KB Created: 2020-08-31 14:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f1435989da5b84da96ba8c4d65c03282 SHA-1: 4579037b98fd4bf319b6a9b7e7ec21e5277229a3 SHA-256: 450a515cad42531f9dbb0644c27da914fab022e49bb5b30ec97614fe29b1d695

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1200 Hardware Add-in

The PDF contains a mass of external links, including a critical redirector link to ttraff.ru. The document body, though malformed, contains the same title as the malicious URL, suggesting a lure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern is the redirection to malicious infrastructure via embedded links.

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.ru/wix?keyword=forma+correta+sentar+ou+assentar
- https://static.usrfiles.com/ugd/8cbfce_dc8663db1da9443897b83dc35e9e9be3.pdf
- https://static.usrfiles.com/ugd/9b7d8a_cb17834647f841abaef0f08b89f7ce41.pdf
- https://static.usrfiles.com/ugd/7f16bd_1ca52b1a69f24146b3412188a169eb2e.pdf
- https://static.usrfiles.com/ugd/b65acf_3c5f85540e7b44538b227d6c6825e430.pdf
- https://static.usrfiles.com/ugd/0f5b72_8358317c34d446d5a10c0055c1f561f2.pdf
- https://static.usrfiles.com/ugd/80c1db_adfb18e3b5be43c9b83616da98ff6c70.pdf
- https://cdn.shopify.com/s/files/1/0436/0483/6515/files/nonparametric_statistical_inference_4th_edition.pdf
- https://cdn.shopify.com/s/files/1/0433/0009/4112/files/comment_apprendre_l_anglais_rapidement_et_facilement.pdf
- https://cdn.shopify.com/s/files/1/0428/4183/3635/files/88533242386.pdf
- https://cdn.shopify.com/s/files/1/0433/8148/9818/files/35518562951.pdf
- https://static.usrfiles.com/ugd/97634b_88c942054e364277a2e1c04f1197ef93.pdf
- https://static.usrfiles.com/ugd/b8c837_a5d7dc1cfffc4c32bd88f0a002258f45.pdf
- https://static.usrfiles.com/ugd/b8c837_ab918a06946b4d48873b31213d183f3a.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_off0000669f.bin` `722dcb064c7be69ebe4f7783cdbee76fcfecabb5bd745e152d6013e60bf971db`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x669F	4868 bytes
`font_01_sfnt_off0000770e.bin` `8fbb6c12efbf9423e579e0c59ea83572216a4a2a517dd1ca9f32859d8dd7c493`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x770E	14516 bytes

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