Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b220a76dd5e22c…

MALICIOUS

PDF

37.9 KB Created: 2020-08-25 05:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb3475d2cf525a3ed752b85b5e9c05bd SHA-1: d4b1dac6324988d34ef2bca1b218e1a92761d124 SHA-256: c8b220a76dd5e22c9f9987fc68d5971d6b1dda35274053d735be6fa584a5f3d5
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with at least one pointing to a known malicious redirector (ttraff.ru). The document body, though heavily obfuscated, contains a reference to the same URL. This suggests a phishing or social engineering attempt to direct the user to malicious infrastructure. No scripts were extracted, and the primary maliciousness appears to stem from the embedded links.

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=simple+theme+for+powerpoint+free
    • http://files.hellenphotography.com/uploads/1/3/0/7/130776743/gamef_riluzuletifutor.pdf
    • http://mabakeb.midwivesadvantage.com/uploads/1/3/0/8/130814328/gitutuzufixumadot.pdf
    • https://cdn.shopify.com/s/files/1/0429/2742/3654/files/xefugenugotixefuxodule.pdf
    • https://cdn.shopify.com/s/files/1/0429/4334/8892/files/brazil_flag_photo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6444/files/cycling_training_program.pdf
    • https://cdn.shopify.com/s/files/1/0428/5015/6700/files/fargo_forum_green_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/5335/0040/files/administracion_de_recursos_humanos_snell_bohlander_2020.pdf
    • https://cdn.shopify.com/s/files/1/0440/8649/3349/files/zazapunas.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7296/files/lugaponefel.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.

FilenameKindSourceSize
font_00_sfnt_off000059c8.bin
5c8a0d77092642a4ff0eedc177b6316ab0be183e823b4e103347acbcd35a3a2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59C8 4948 bytes
font_01_sfnt_off00006a85.bin
88db4d5626e2d120dc5cef54f91a5a3e1182142905b90ca49472af337ab03d29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A85 9612 bytes

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