PDF malware analysis — malicious · 4470c72cb0874553

MALICIOUS

PDF

47.5 KB Created: 2020-09-01 03:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e7c7158b3a0faeee87e98b8411afb967 SHA-1: 9a7bf9d0f19b91e64ca5053d3985ceb41108e7d1 SHA-256: 4470c72cb08745537bf5a0334d435f9e36a35f97ff441c08831ec685d789a18a

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is presented as a lure for 'must play android games 2019'. The document also functions as a link farm, containing numerous external links, many pointing to static.usrfiles.com. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a malicious URL.

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/pify?keyword=must+play+android+games+2019
- https://static.usrfiles.com/ugd/b8c837_45596a660d2d478ab33f6b427a3f0e8f.pdf
- https://static.usrfiles.com/ugd/dc8a8e_dcd1b6a2c4404900979a67d62981bc40.pdf
- https://static.usrfiles.com/ugd/48f461_203cb95f4d98479588bd53de165c6939.pdf
- https://static.usrfiles.com/ugd/b80405_8c3ac1925cb8479daa17481cce9c36b5.pdf
- https://cdn.shopify.com/s/files/1/0438/4541/9173/files/cub_scouts_bear_den_leader_guide.pdf
- https://cdn.shopify.com/s/files/1/0465/3088/7838/files/new_android_games_apk_data.pdf
- https://static.usrfiles.com/ugd/80c1db_1e50c6bc474a46a9a414a96d649f5d7a.pdf
- https://static.usrfiles.com/ugd/b8c837_0b1a0131686e46e4a3684d376a4be5a1.pdf
- https://static.usrfiles.com/ugd/d7ba0f_7eacead37258401fadbdbeb5e21f7a2f.pdf
- https://static.usrfiles.com/ugd/dfb5f8_f7c23fa8fbbb455fa1be984f3de8c479.pdf
- https://static.usrfiles.com/ugd/b8c837_09e163782efa4afaade876bacddeddee.pdf
- https://static.usrfiles.com/ugd/b8c837_3c241bf2bd904e6089d9dccdb7324562.pdf
- https://static.usrfiles.com/ugd/b50c55_42b7c284ac3a45e084d5ab5173580e2b.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_off00007a2a.bin` `9b25466a8ffd0a52b1a5033ae3f8830ad77eee91c18da1d0696b097cd2915c0e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7A2A	5868 bytes
`font_01_sfnt_off00008e27.bin` `64a48a721866f2d5c809f1c640a8915d74e0098ea86e593ee7ace88a7dc3e5ed`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8E27	10364 bytes

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