Malicious PDF — malware analysis report

Static analysis result for SHA-256 c958150e9b3c6b6e…

MALICIOUS

PDF

45.4 KB Created: 2021-06-07 13:13:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 377c6657bf2e31ab0ea5760e90529908 SHA-1: ca05bc491bae2b0459e17a1c79d359df9e1e8fa7 SHA-256: c958150e9b3c6b6ef6e6cb9aac083331e067a4b5ab8bcaa891e5473d260ef4c7
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 0.9864

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/roblox-murderer-mystery-2-cheat-codes-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/roblox-murderer-mystery-2-cheat-codes-game-hack PDF link annotation
    • http://www.mostraining.co.za/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.mostraining.co.za/images/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • http://www.mostraining.co.za/images/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.mostraining.co.za/images/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • http://www.mostraining.co.za/images/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://www.mostraining.co.za/images/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.mostraining.co.za/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.mostraining.co.za/images/minecraft-free-online_GM479516143.pdfIn PDF document text
    • http://www.mostraining.co.za/images/coinmasterfree_GM406889139.pdfIn PDF document text
    • http://www.mostraining.co.za/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.mostraining.co.za/images/minecraft-windows-10-free-trial_GM479516143.pdfIn PDF document text
    • http://www.mostraining.co.za/images/tiktok-free-jeton_GM835599320.pdfIn PDF document text
    • http://www.mostraining.co.za/images/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • http://www.mostraining.co.za/images/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://www.mostraining.co.za/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.mostraining.co.za/images/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • http://www.mostraining.co.za/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://www.mostraining.co.za/images/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.mostraining.co.za/images/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://www.mostraining.co.za/images/free-minecraft-maps_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_off0000535a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x535A 24956 bytes
SHA-256: 925d6459cb2dc93e8f8e9aab41d4416ed4abe5aae6a3436938530fb932499584
font_01_sfnt_off00008c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C47 19096 bytes
SHA-256: 62a8e57be8bef2655f5dc7cc6f0a5f3e86ffc5a2e9415d3614025eb2aa8f2ae1

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