Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9ff044c719eba1…

MALICIOUS

PDF

42.7 KB Created: 2021-05-13 00:41:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0e43c94060e97a641049f9bf4546211b SHA-1: 2d246d42084e299e6fc47ecbbca7d70b629d0338 SHA-256: 8b9ff044c719eba12a7069d3681b8650c51c5f52fc6cbb38e890f4619881deda
102 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 callback-phone (TOAD) 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 0.9971

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/406889139/coin-master-hack-apk-online-game-hack PDF link annotation
    • https://repository.poltekkesgorontalo.ac.id/repository/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/free-roblox-intros_GM431946152.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/hacked-client-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/coin-master-spin-link-free_GM406889139.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/coin-master_GM406889139.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/roblox-a_GM431946152.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/free-spin-link-for-coin-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
stream_003_off00004c76.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C76 25204 bytes
SHA-256: 9b011665c14e66d20bcbc933065b3ad41faedacf6bf5524b9c459a95cefaad65
font_01_sfnt_off0000858c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x858C 17968 bytes
SHA-256: 242ffb3ae23aaa88f863c4a264d986e0fcfba56dd77541db73c8f2987a2b9a1c

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