Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb275519fc7badd3…

MALICIOUS

PDF

44.6 KB Created: 2020-08-08 07:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b5f52195743e323edc26543e91cef24 SHA-1: 766479e081db56839909fbd02f8afc0c41ea96d7 SHA-256: fb275519fc7badd35a98d52227c309ae0eb0d477b04a4c1617eefa9d8b202cc7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains but also including a critical redirector link to 'ttraff.ru'. This indicates a link farm or redirection strategy to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users to external sites via these 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=generation+of+carbanion+pdf
    • http://kegifaxi.instar-program.org/uploads/1/3/1/4/131453109/464c30f1bcca87.pdf
    • http://files.mortarandpestleproductions.com/uploads/1/3/1/4/131407823/3555731.pdf
    • http://files.claytoncountryclub.com/uploads/1/3/0/7/130775776/1830921.pdf
    • http://files.calojostaffords.com/uploads/1/3/0/9/130969404/kituzere_xavidefumevik_bimaxisimagexaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/vogivojurozebedaluxij.pdf
    • https://cdn.shopify.com/s/files/1/0433/8309/5459/files/bobekez.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7464/files/88041332746.pdf
    • https://cdn.shopify.com/s/files/1/0435/1148/0472/files/dowukoloxudabivifusovexi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0621/3789/files/muxegemivifodaxumituposat.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/answers_to_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0430/9463/8749/files/kipesupeminoxakafomubaje.pdf
    • https://cdn.shopify.com/s/files/1/0434/1543/7468/files/tetapugaxirikivutujuwilu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5812/7270/files/duwokogunixunadimipirameb.pdf
    • https://cdn.shopify.com/s/files/1/0432/1751/8751/files/nitoladifarebodemoru.pdf
    • https://cdn.shopify.com/s/files/1/0431/4457/7178/files/854786321.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006257.bin
8426654d6456730bd2e37db0a24dcc33077411635dd09e12d52e8c189bbf2ece		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6257 4896 bytes
font_01_sfnt_off000072fe.bin
33e5922ede6118d96ced5847ed342ecf89a623cfc4f84c5d0dab3519e5486be2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72FE 10652 bytes
font_02_sfnt_off0000975e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x975E 4324 bytes

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