PDF malware analysis — malicious · 94b65d2d558a19ef

MALICIOUS

PDF

46.2 KB Created: 2020-09-02 10:39:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e508e0bac2c7533c1653653b240e0129 SHA-1: 1cba5bf9ad69aac837169016171dd636c1cec836 SHA-256: 94b65d2d558a19ef1aba22c095ea46fbf2c5291efeecd72996229a4d5e72b987

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The document body text, though heavily obfuscated, contains keywords related to hacking and APKs, suggesting a lure for potentially malicious software. The ML classifier strongly indicated maliciousness, and the presence of a link farm reinforces the malicious intent.

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=baseball+boy+hack+money+apk
- https://static.usrfiles.com/ugd/a86d68_5882fb6d33e24522ad69eb0a355d40e5.pdf
- https://static.usrfiles.com/ugd/b8c837_ffe5f4d356c04db99c343782e2aaf3dc.pdf
- https://static.usrfiles.com/ugd/fe0276_858b59b4350a476198c25fc0d2c2bd56.pdf
- https://static.usrfiles.com/ugd/e481ce_98d652158b7d4738811c4cc87228aea6.pdf
- https://static.usrfiles.com/ugd/04c368_165715312b074b47b2e3cbfeb80047c7.pdf
- https://static.usrfiles.com/ugd/9421c8_2e20c60815384f028e397d0a13a0b1da.pdf
- https://static.usrfiles.com/ugd/5be868_c05fd1d2cb8246719d5cf6c1aa7050d3.pdf
- https://static.usrfiles.com/ugd/ab922d_d33abca7bd0e416f9699582e2aa9b0a2.pdf
- https://static.usrfiles.com/ugd/1cfe37_982375995925445ab1bf8372fb32dff6.pdf
- https://static.usrfiles.com/ugd/70094d_819225e469ba4443abdf603e95d79cbd.pdf
- https://static.usrfiles.com/ugd/87b9a8_2707ef70bed543c38fc15b2158f7b0bc.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006af8.bin` `45aa07df5c90280db82f996aed4b18f61a767bc27ccfa41adcf4e020d76cf8c0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6AF8	5092 bytes
`font_01_sfnt_off00007c18.bin` `1e284563c76767893b850fb718a8f2d287d1fea5dc0ff3f3b981417bc68dc6d2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7C18	9956 bytes
`font_02_sfnt_off00009e40.bin` `0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9E40	4324 bytes

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