PDF malware analysis — malicious · c04467e2cb8012f6

MALICIOUS

PDF

35.0 KB Created: 2020-08-31 03:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1a6b67065f3f313c34cf16e94aaaaf62 SHA-1: fad52a1282678b0189d4b59b90dd5b7f75a295cc SHA-256: c04467e2cb8012f6c4cccc0615fa8208e11e067e7a0b0e376d69e855cfcafadb

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This URL is used in conjunction with the document body text 'Cwm.zip apk download' to entice the user to click the link. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to 'static.usrfiles.com'. The ML classifier 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.ru/wix?keyword=cwm.zip+apk+download
- https://static.usrfiles.com/ugd/b48b60_e962e213203543dfbda141869477a320.pdf
- https://static.usrfiles.com/ugd/b8c837_362ce055998348668a5072dc3eb203d9.pdf
- https://static.usrfiles.com/ugd/895bef_4459b3f18d8a4ddaa91ebf081bcb6a6e.pdf
- https://static.usrfiles.com/ugd/b8c837_4985129fd57a4576b36b95f300dba106.pdf
- https://static.usrfiles.com/ugd/696b8a_9ea0c96c3a074d3d8eb5f316103b0570.pdf
- https://static.usrfiles.com/ugd/5fd5c1_de534973b46a4d64af92a9b6e25d2aeb.pdf
- https://static.usrfiles.com/ugd/f63f29_980a72aeb4a7407fb3372f548446d9fa.pdf
- https://static.usrfiles.com/ugd/b8c837_f52ec25b35d0407d8f27524e9b91a89d.pdf
- https://static.usrfiles.com/ugd/b8c837_4ef59de70b2542929d34f1e4a13040d5.pdf
- https://static.usrfiles.com/ugd/2ca09c_ff5f37f7e9384a8587c479c78218e495.pdf
- https://static.usrfiles.com/ugd/b8c837_f78d46a3fb8e4ce5b1b3cedb913d67d8.pdf
- https://static.usrfiles.com/ugd/7dd30d_6b935b46309248eeb47f41ff64552097.pdf
- https://static.usrfiles.com/ugd/1d64af_72c9f3eda556430583e2b06baf5942d4.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_off00004e6a.bin` `c22e6635bfbb7848bfca0aba3cf67b60085e65e7dfc1857551b03d0fa4d209d9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4E6A	4976 bytes
`font_01_sfnt_off00005f5c.bin` `012529a27942b1806641fa47dda7690b1601fabd7e2a6b18160d67449a095013`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5F5C	9536 bytes

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