Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7f942b45d07f5e…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 08:27:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 75dbe81c69de50a2d68e4c77a66223a8 SHA-1: dbbbf70a14dabcda2c8cfaaceb56ba02a9cdfdba SHA-256: ec7f942b45d07f5e223bb23ac73799b039128425f6f3308d52deae66d23fa8bc
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of 'free Robux' and game hacks to entice users. It contains multiple embedded URLs, with a primary redirector at http://netcdn.tw/app/431946152/earn-robux-now-game-hack, which likely leads to malicious content or phishing pages. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

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.tw/app/431946152/earn-robux-now-game-hack PDF link annotation
    • http://elibrary.smknesbu.sch.id/repository/free-robux-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-clothing-apps-in-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/hack-the-robux-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robux-hacks-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-kat-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-giver-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/hacks-for-mm2-in-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-hack-robux-and-tix_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/adopt-me-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/hacking-commands-for-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/hack-money-vehicle-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-almost-any-game-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/december-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-dragon-ball-infinity-saga-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-hack-download-mobile_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-anomaly-breach-cheats_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-roblox-exploits-that-are-safe-vermillion_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/pubg-600-uc-in-pakistani-rupees_GM1330123889.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_off00002d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D08 22792 bytes
SHA-256: 620e5461e6a132ecbacfebdd1a73e815cb5adb2b4c1f71f746bdfe3559e866cf
font_01_sfnt_off00006037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6037 18716 bytes
SHA-256: ad9d788a26765a58da61a35e1cf8ac4777a7c6bf95241a2670242caf96161301

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