Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a84df4b73d19d5…

MALICIOUS

PDF

44.4 KB Created: 2021-06-03 07:55:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 83b18e29e41b59e8b5b90cd096dcde35 SHA-1: 182a8ce173cad6883742f3f7bf2d9a422df18108 SHA-256: a9a84df4b73d19d5c214cee03bff3bc4450ddfe40f60f2d7644a8bea0a66dc39
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 0.9865

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 https://netcdn.online/app/835599320/tiktok-free-view-30-game-hack PDF link annotation
    • http://muslib.unmus.ac.id//repository/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-116-free-download_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/get-free-spins-on-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/blogspot-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-purple-hair-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-avatar-ideas_GM431946152.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_004_off0000505b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x505B 25532 bytes
SHA-256: d15fdd7dcbaabcc48d840b5b9a50744ff1dbfd75cf24eea3d733dedf58305fbd
font_01_sfnt_off00008b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B45 18100 bytes
SHA-256: 2d44a100b32b829fa28c0b825b58d352e76dbddf39e4a184ec725028a21dc124

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