Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4c95b7fcb25b63…

MALICIOUS

PDF

42.4 KB Created: 2021-05-19 07:09:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 500b6f04d8821e44a6c4df9883259465 SHA-1: 11285908149c9db2eccb29a9de0801cd88acb6e9 SHA-256: ff4c95b7fcb25b636434a0093570e84ea38214318bdc20daf4dc85def328e98e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://netcdn.xyz/app/431946152/microsoft-bing-free-robux-game-hack PDF link annotation
    • https://www.donjastubica.hr/files/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-robux-app_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/www-rbx-com_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/hack-version-of-coin-master_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/www-rubux_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://www.donjastubica.hr/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-spin_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/como-hackear-coin-master-2021-espaol_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004782.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4782 25596 bytes
SHA-256: e2d469a2f095d692cf06a97001d3bd19c0c4643115cb21d6eace79866a06abb4
font_01_sfnt_off000081ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81EE 18720 bytes
SHA-256: f6da71d3ec7876d1f2450260025b1db4712d77c7886386833aafb50cc2347919

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