Malicious PDF — malware analysis report

Static analysis result for SHA-256 a307fdcf8b2f2515…

MALICIOUS

PDF

52.2 KB Created: 2020-11-07 01:26:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a0fff9d694091c5a319362b9e3e73d3 SHA-1: d1bfa0e2601baaae0a46250de3a5b156cea7ca7e SHA-256: a307fdcf8b2f2515f838fb8b90c42e2c40d9486e722faf7327794680b81b3bfd
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to WordPress hosted PDFs, suggesting a link farm for SEO manipulation. One prominent URL, 'https://trafftec.ru/123?keyword=adobe+premiere+pro+cc+cracked+download', indicates a lure for cracked software. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests the document is designed to trick users into downloading a password-protected archive, a common tactic to bypass security scanners. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?keyword=adobe+premiere+pro+cc+cracked+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fizafadolozu.files.wordpress.com/2020/11/31713389540.pdf
    • https://wotenopofe.files.wordpress.com/2020/11/budixaw.pdf
    • https://fovodifikade.files.wordpress.com/2020/11/10876504859.pdf
    • https://gorujugiximu.files.wordpress.com/2020/11/karipevo.pdf
    • https://pomobuvumedu.files.wordpress.com/2020/11/brand_identity_prism_template.pdf
    • https://redoruta.files.wordpress.com/2020/11/data_structures_and_algorithms_made_easy_by_narasimha_karumanchi.pdf
    • https://toranibu.files.wordpress.com/2020/11/80234717881.pdf
    • https://vasedaroxito.files.wordpress.com/2020/11/43559079740.pdf
    • https://jabilefok.files.wordpress.com/2020/11/95244436333.pdf
    • https://vuxuwavu.files.wordpress.com/2020/11/graphic_novels_ielts_reading_answers.pdf
    • https://sirilab.files.wordpress.com/2020/11/pukoloxutudikadijogo.pdf
    • https://tafexoru.files.wordpress.com/2020/11/3294531957.pdf
    • https://s3.amazonaws.com/batoragubukepo/film_producer_jobs_los_angeles.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006be2.bin
726223580f08881e718aac6bc5e93ad6ee630ae8f523ea47ddc5c98a709015f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE2 5328 bytes
font_01_sfnt_off00007df9.bin
c843334995493d145d60ff8bc57152b913438eeb185af58b24a7d54777c4ddba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF9 15708 bytes
font_02_sfnt_off0000aef6.bin
8f676b3be356e2086f34f7c81dd3575184be90372cbe0b4aaba7ba30be3377d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF6 16060 bytes

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