Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0b8e0d501c8300…

MALICIOUS

PDF

49.4 KB Created: 2020-08-30 06:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e130e3ad91903851ad0737fba970001a SHA-1: 2fe2e0f2ae890b703c99197f330f2ac33286673b SHA-256: 9d0b8e0d501c8300cbd8bf12405d0c6517269832bd6ce42472e33cda85a5c694
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was identified as malicious by a machine learning classifier and contains a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=editing+marks+lowercase', which is flagged as malicious. Additionally, the PDF contains a mass of external links, many pointing to 'static.usrfiles.com', indicating a link farm likely designed to direct users to malicious content.

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=editing+marks+lowercase
    • https://static.usrfiles.com/ugd/b8c837_65578ffde2174e11a61e8ae217c79e0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a21b72bb2cfa43b981a0160bcc6d9be2.pdf
    • https://static.usrfiles.com/ugd/804ff6_a0732f38fc2d45288902c1f9ce8b7943.pdf
    • https://static.usrfiles.com/ugd/b8c837_5256334a210048ee94a97f102978c2ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_5bce332ee5b64ffbb48fa358c04ce955.pdf
    • https://cdn.shopify.com/s/files/1/0430/5852/8405/files/wifasol.pdf
    • https://cdn.shopify.com/s/files/1/0429/5737/3589/files/joworij.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/27655858197.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/wojinoxexegutudir.pdf
    • https://cdn.shopify.com/s/files/1/0429/3692/6374/files/repolutolegudat.pdf
    • https://static.usrfiles.com/ugd/87fdc7_69ca148e211549639962c8df1e3a1c47.pdf
    • https://static.usrfiles.com/ugd/3f4b99_d46f3430730a432abd66fbddebea17ab.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d96.bin
7d7851b54cf527a1c8e156259eed505b41a8c19987debac286391d4b7063d720		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D96 5372 bytes
font_01_sfnt_off00006f95.bin
af0352811651a3ad9f29f7c5730b463e63500069e80d5a557582bc25c41877a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F95 6376 bytes
font_02_sfnt_off00007f3c.bin
9ce0f896243cb465f8eb7d49a896c8d0b70ec8310dbb21194fc01362b188a6e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3C 10316 bytes
font_03_sfnt_off0000a282.bin
c845a9e8ca3c0346fc548563bd0155fd7cbe850ea216bea519575a8834fa8cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA282 16244 bytes

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