Malicious PDF — malware analysis report

Static analysis result for SHA-256 551001525b937fd3…

MALICIOUS

PDF

43.7 KB Created: 2021-06-09 01:42:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d5200da593d9144b72ba31925a92bfdd SHA-1: 149628604332c36325ff32a058c8c5b1448569cd SHA-256: 551001525b937fd3a5277cb4e63e8aad3b299b746665f7c33c6e290c47eef790
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/blox-piece-roblox-hack-game-hack.
  • 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.tw/app/431946152/blox-piece-roblox-hack-game-hack PDF link annotation
    • http://sbm-nn.ru/images/free-roblox-toys_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/unlimited-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/descargar-hacks-para-roblox-gratis_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-trolling_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-2021-apk-download_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-app-cheats_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-make-your-own-minecraft-server-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
font_00_sfnt_off00004f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F7F 24536 bytes
SHA-256: 6723ca3c769aecc18f9570c4d753b4e42b05e99eb6f0d3e78495a8a95dfc3277
font_01_sfnt_off000087b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87B3 18456 bytes
SHA-256: 93775179ed2ad3fcf98b250a325fb4ad038751256016d20c0f903d3999e84c7d

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