Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9be456bb2976175…

MALICIOUS

PDF

34.5 KB Created: 2021-06-18 06:52:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 17ca47fe6079f5d69ed98e7d09fdc43b SHA-1: 1ad5a96b85269e5c4aa25257091b1551b1251eaf SHA-256: c9be456bb2976175c7b5876c63beb91c144386271e9bc81e651569dcb4eab530
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9980

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 http://netcdn.co/app/431946152/free-robux-offline-game-hack PDF link annotation
    • http://sellitafrica.com/media/storage/editor/files/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-root-hack_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/sb-game-hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-tiktok-likes-2021_GM835599320.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-roblox-card-generater_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/robux_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-hacks-for-pet-food_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/robux-scam_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-coins-for-planet-master-game_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
font_00_sfnt_off00003187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3187 22256 bytes
SHA-256: d9ba647f0656800a1d19c202110620ba45c68cce76276bacde8369d0c2d2c7c2
font_01_sfnt_off0000630c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x630C 18724 bytes
SHA-256: b87f2d20bac08ed0fb35c48a4c270db46da1b2ae00c63556cf271464b082f0c8

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