Malicious PDF — malware analysis report

Static analysis result for SHA-256 540325468df569b5…

MALICIOUS

PDF

49.2 KB Created: 2021-06-09 14:38:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5882b93329b9b6990b45efdd7987679a SHA-1: 525cd0e763ed1163610f2e4cbfd8441ce0a0dbb1 SHA-256: 540325468df569b5eae42df20ee81ad0eb3c4e5abfd5248c29f05dea0caf5ff1
122 Risk Score

Malware Insights

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

The PDF document contains a lure for 'free Robux' and a fake CAPTCHA, directing users to a malicious URL. The embedded URL, https://netcdn.tw/app/431946152/free-robux-today-only-game-hack, is likely intended to deliver a malicious payload or lead to further compromise. No scripts were extracted, but the document's structure and heuristics strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • 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
  • 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/free-robux-today-only-game-hack PDF link annotation
    • http://repository.ummy.ac.id//repository/free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-obc-roblox-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/how-to-hack-knifes-in-assassin-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-data-breach_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/hacker-des-personne-sur-roblox-pc_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/pokemon-go-free-qr-code_GM1094591345.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/how-to-hack-robux-with-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-cheat-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-link-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-pink-free-robux_GM431946152.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_off000052e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E4 28636 bytes
SHA-256: 7492f94122503156fe2d12dc8ae13cd70add39652dc517c461622c76ffe5e055
font_01_sfnt_off000092cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92CB 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00009c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C79 18668 bytes
SHA-256: 79bd9da118c5a49e89914b0104752550ffaf852f906651ddffe29516ed5dedc0

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