Malicious PDF — malware analysis report

Static analysis result for SHA-256 883d2da731fe2be8…

MALICIOUS

PDF

35.2 KB Created: 2021-07-09 03:43:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a6bb961b084459dea8f211cd09248b88 SHA-1: a2dd71e959eb0db63906b1058f45dc28d77591c3 SHA-256: 883d2da731fe2be8b92ce01894007e837a5f292df546fec75446655d8bcb0f62
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a social engineering tactic by promising a 'game hack' for Roblox accounts to lure users into clicking a malicious link. The primary malicious URL identified is http://netcdn.tw/app/431946152/how-to-hack-peoples-roblox-accounts-game-hack. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/how-to-hack-peoples-roblox-accounts-game-hack PDF link annotation
    • https://www.tiancom.com.tw/upload/files/roblox-avatar-tester_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/hack-cbro-roblox_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/roblox-script-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/hoq-to-buy-anything-from-catalog-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-get-2021-robux-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/anti-hack-plugin-roblox_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/play-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/hack-robux-2021-do-inspect-element_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/robloxhack-me-do-you-want-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-make-your-own-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/roblox-creepy-elevator-hack-script_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.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_off000030a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A9 22688 bytes
SHA-256: 042aced21feeea4eb4ed44aaa611f6bb479436d3942b4ffe9bad2e325ca654a5
font_01_sfnt_off00006368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6368 19392 bytes
SHA-256: 455054d53819942057d20be51cc97c11c8340df0e33a1662ffdae35838096838

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