Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2f3976627bf9ab…

MALICIOUS

PDF

46.7 KB Created: 2021-06-03 08:59:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 32510debf33caa3292015ce4df5c7d66 SHA-1: f17962c6ae9b050597e27b670db5996dd9526e90 SHA-256: 4b2f3976627bf9ab3d73dc3d3d2ef73f6e36fdd4c8218c3f4539979c658764c0
162 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 and a fake-CAPTCHA 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 0.9748

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/431946152/free-roblox-intros-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.online/app/431946152/free-roblox-intros-game-hack PDF link annotation
    • http://perpus.i2s-learning.com/repository/can-you-evolve-trade-pokemon-without-trading_GM1094591345.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/roblox-moderators_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-online-hack_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/aimbot-download-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/unlimited-spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hack-iosgods_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/mcpe-master-hack-unlimited-coins-apk_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f53.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F53 24648 bytes
SHA-256: a8fa840623bb6ea54f02635365b97bb05ebe8781885d595083cc7df570bb7ff9
font_01_sfnt_off000087c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87C7 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off0000946f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x946F 18052 bytes
SHA-256: 96373f35ee075c3be11c8e4c64eb77f13cb7d9769cc235bfbcc2c5e9d23a424f

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