Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3ca317ed3e8c39…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 04:53:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 69685a695440e7f4c1a79a29da060f77 SHA-1: 258004ffa9862c12f9d2bc9b0928ae8916bf5f3c SHA-256: 0a3ca317ed3e8c39a53b2b5d8ae63006ba0baaec56a88b9c47ed6181c8639a04
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'free Roblox accounts with Robux' and a direct link to a URL that appears to be a game hack generator. This, combined with heuristics indicating a redirector and a general malicious PDF classification, strongly suggests a phishing or scam attempt. The document body, though heavily obfuscated, contains the primary lure URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/431946152/free-roblox-accounts-with-robux-that-work-2021-game-hack PDF link annotation
    • https://www.library.kysm.edu.my/repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/will-tiktok-free-download_GM835599320.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/toolbox-for-mcpe_GM479516143.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/free-coin-master-spins-no-verification_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/robux-scam_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-hack-xyz-2021_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-hack-spin-link_GM406889139.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
stream_004_off0000504a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x504A 24276 bytes
SHA-256: 95b12adc8fff4d1c554e38e2b48a76907cbefce1417d7f5ea29703f0dde92914
font_01_sfnt_off000087e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87E4 19476 bytes
SHA-256: 4c7cb67921980cc467a624d7be0aa4f8f19dcdcb8d4cb789adc94de6f70366aa

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