Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcad910d573ff8a…

MALICIOUS

PDF

34.1 KB Created: 2021-06-25 12:36:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2cd58ba104097bd0964f03ac3679e4ec SHA-1: 71d1eb2af2d3f4bcbd3185d22eafdec9e2d24403 SHA-256: efcad910d573ff8a76179fb9053529a9769154b94a8bc0f06f84409d28c5adaf
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 0.9980

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.
  • 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 http://netcdn.co/app/431946152/roblox-raf-free-game-hack PDF link annotation
    • https://razredna-nastava.net/files/coin-master-hack-pro-gamers-com_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-get-free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/pubg-uc-myanmar_GM1330123889.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-free-vip-games_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-mod_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-34-5-hack_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-tiktok-accounts_GM835599320.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-youtube-video_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-mods-in-minecraft_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_off00002eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EEB 22556 bytes
SHA-256: 6caa9a8f96560746536d478cfe079e2a411eb2592fe872099144184a12e100b0
font_01_sfnt_off0000616c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616C 18652 bytes
SHA-256: 90fdc4554aac4f57da0e2b63db152b0bf97fb258dc89eda18b7b9e6dac8456c4

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