PDF malware analysis — malicious · c77c95eaf3167fd1

MALICIOUS

PDF

35.7 KB Created: 2020-08-29 20:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1d8b9d54ed93705472f00855dcabc628 SHA-1: d61892aa2b6d826a7c276b3ed1e1bbf29319ea1f SHA-256: c77c95eaf3167fd1acc99444ef9980a1d37922ccb6062f792a3e502a9a3fde47

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm and a specific malicious redirector URL, indicating a lure to external content. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Nba 2k13 apk data' and the malicious URL, suggesting a phishing or malware distribution attempt.

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=nba+2k13+apk+data
- https://cdn.shopify.com/s/files/1/0428/5064/8223/files/25150977685.pdf
- https://cdn.shopify.com/s/files/1/0434/1651/8805/files/51677228345.pdf
- https://cdn.shopify.com/s/files/1/0437/6874/2040/files/formulaire_declaration_cnss.pdf
- https://cdn.shopify.com/s/files/1/0431/8180/1629/files/24997869078.pdf
- https://cdn.shopify.com/s/files/1/0435/9297/4499/files/29534609141.pdf
- https://static.usrfiles.com/ugd/b8c837_94f15a7589ab442185a06ff5ac978955.pdf
- https://static.usrfiles.com/ugd/b8c837_db3253c0efc7482b895a918465f5b309.pdf
- https://static.usrfiles.com/ugd/e73fea_f0768921a60a486eb5776b024f8cbbd0.pdf
- https://static.usrfiles.com/ugd/b8c837_aa43855117d7412ab7489465ef3d455e.pdf
- https://static.usrfiles.com/ugd/b8c837_b06b80f368354e09bc7238c2ff9dcb16.pdf
- https://static.usrfiles.com/ugd/b8c837_495b255cf0bb4d7cac6070c91c4eddff.pdf
- https://static.usrfiles.com/ugd/078c79_aba0de76ff844640a1162d2a3ddd9f47.pdf
- https://static.usrfiles.com/ugd/b8c837_ca084c4f7b0541d7baabb864e8fe120d.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_off00004e7d.bin` `5effb11c0e00ab1b3c23a8213e62a179a531d86d513c3c5c1ef20ecf6a52d0bb`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4E7D	5168 bytes
`font_01_sfnt_off0000602a.bin` `84eb63f033b50a34ccfff19eb3a8394990f6a0405194e22c2ea1203b229b447a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x602A	10000 bytes

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