Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8e3f01b33cb9c0…

MALICIOUS

PDF

43.5 KB Created: 2021-05-12 07:39:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5e8dced4b0637bd749b9fb7858d9cb76 SHA-1: 104367dc05c2b5f46360664317128521b21342f9 SHA-256: 3b8e3f01b33cb9c00671fa7c841236369c6867a062ae0d70deaa71580e4b0aaa
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 0.9969

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/479516143/free-minecraft-realms-to-join-game-hack PDF link annotation
    • http://kermas.eu/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/how-to-send-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/is-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://kermas.eu/images/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/robux-miner_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/robux-best_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/master-coin-free_GM406889139.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_off00004977.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4977 30900 bytes
SHA-256: ff7341f4bb8684385f878a8656dd2bca004988c627de9dea5b1e29c5f429a557
font_01_sfnt_off0000881c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x881C 18208 bytes
SHA-256: 07ea4a0a65e268d617c6aeb2efc29ec1284b659111274d24dd89fc4161b37103

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