PDF malware analysis — malicious · 453c86c85876dd1f

MALICIOUS

PDF

106.5 KB Created: 2020-08-29 06:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d2c5f2aac881f56e9d458b2e536856ea SHA-1: 1bd2ca7a66e30a42f7a980f10e7d78ef4385fd26 SHA-256: 453c86c85876dd1f68976fa94c5f2dce4b6141e090b23c5d0f3c35e51f858a7a

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded external links, with 24 links identified as part of a link farm. One of these links, https://ttraff.ru/wix?keyword=antiguo+testamento+cuando+se+escribi, is flagged as pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body itself is largely unreadable due to encoding issues but contains the aforementioned suspicious 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/wix?keyword=antiguo+testamento+cuando+se+escribi
- https://static.usrfiles.com/ugd/b8c837_56dd455462e7419abe3af69b4c9d6f31.pdf
- https://static.usrfiles.com/ugd/b8c837_bbd5105def9649e1a620f65a4156f451.pdf
- https://static.usrfiles.com/ugd/b8c837_9e4d68cb59ec4e08b0337687bd48d99e.pdf
- https://static.usrfiles.com/ugd/b8c837_0252aac7b25f41178d4ae09497bf6393.pdf
- https://static.usrfiles.com/ugd/b8c837_8bcdf4e5c09640b0a4409c552cea4669.pdf
- https://static.usrfiles.com/ugd/b8c837_1afed4af97774fb89ac2cd30adfd8427.pdf
- https://cdn.shopify.com/s/files/1/0440/3278/6597/files/35019767135.pdf
- https://cdn.shopify.com/s/files/1/0431/8799/4792/files/76496758254.pdf
- https://cdn.shopify.com/s/files/1/0433/1867/3566/files/21695838334.pdf
- https://static.usrfiles.com/ugd/b8c837_c9f4b174f61645f79f40a03a6def8439.pdf
- https://static.usrfiles.com/ugd/b8c837_83e238e609754ece8cb303595b7fac41.pdf
- https://static.usrfiles.com/ugd/b8c837_effd39af4ac145d3ad4c24de40568546.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_off0001619a.bin` `d1c31d57f5ec7588985996d4c3bdff0577ff9ec744744a3c6e9ec63215b7bdf7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1619A	5356 bytes
`font_01_sfnt_off000173b1.bin` `fa2677f524378ea4a1304c2e8bad0c8e570a1f81143f636f5bc16570f19d5504`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x173B1	12316 bytes

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