PDF malware analysis — malicious · d29d21366895d11b

MALICIOUS

PDF

41.6 KB Created: 2020-08-29 14:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: dd8cf9f1da743501cb6566ab43504195 SHA-1: ff3539717529d626ec0d2cc81bdb45273d6469fd SHA-256: d29d21366895d11b72c13fb082df3205dbec270dde1698f672e05d24afc95f6f

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and other benign-looking PDF filenames, suggesting a lure to a malicious site.

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=halo+glasslands+read+online
- https://cdn.shopify.com/s/files/1/0429/2352/4259/files/acetilcolina_farmacologia.pdf
- https://cdn.shopify.com/s/files/1/0439/2927/2488/files/27614267519.pdf
- https://cdn.shopify.com/s/files/1/0431/8615/9767/files/bcom_sem_4_books_gujarat_university.pdf
- https://static.usrfiles.com/ugd/b8c837_5582239335634f1e99800c337b8d7263.pdf
- https://static.usrfiles.com/ugd/b8c837_c6de522c080f4975b8f253594b0f6570.pdf
- https://static.usrfiles.com/ugd/b8c837_15e2403becef4676ae52a0c0f743d93c.pdf
- https://static.usrfiles.com/ugd/b8c837_c60f0e16c4c7435696cc43e21fbc263b.pdf
- https://static.usrfiles.com/ugd/b8c837_be23d90a8e484ac28f3de1816efc77e2.pdf
- https://static.usrfiles.com/ugd/b8c837_7db0d350fd5647a1a2727bb7f3977c85.pdf
- https://static.usrfiles.com/ugd/b8c837_cf53d8e365f34b8cb2a280aba733265a.pdf
- https://static.usrfiles.com/ugd/b8c837_5bd8a78e42484b0187cfcc6f3640ee6e.pdf
- https://static.usrfiles.com/ugd/b8c837_a6a3ec104de940039daacf2f0f0ef7af.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_off000064ed.bin` `57436f95cdca46b207fdda6b5a12580942032cd3a6de52969590d5a59d4ddeab`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64ED	4956 bytes
`font_01_sfnt_off000075d0.bin` `af03f3e13ab74715c9dab15bd1dd85d0cfda2cbbf7eaa3d0d06024d46ef5e26e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x75D0	11008 bytes

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