Malicious PDF — malware analysis report

Static analysis result for SHA-256 921f55c21947a78e…

MALICIOUS

PDF

49.2 KB Created: 2021-06-07 12:25:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 798130d7188eeb8c128ab7f92304a44c SHA-1: 44484a3180d246f0b5006d23fc3aeb8b4143f54a SHA-256: 921f55c21947a78edf484108b59fd9ccba7b105d013c9050a386286a70f88026
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, disguised as "free generators" or "game hacks" for popular games. The primary lure URL is https://netcdn.tw/app/431946152/free-roblox-gift-card-code-generator-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious redirection, likely leading to further malware or phishing content. The document's content and linked URLs suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-roblox-gift-card-code-generator-2021-game-hack In PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/www-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/pokemon-go-free-money_GM1094591345.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/mcpe_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/500-free-spins-coin-master_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_off000052e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E3 26468 bytes
SHA-256: 84f5dfeca3115a101d608bfa7290d54ae74f5d3c3aa16bc6e5f649d758941b09
font_01_sfnt_off00008e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E98 3656 bytes
SHA-256: 63a179d8a9645bea05c6d53b1776faf4e4a7281930de6cf484e639846bec2e20
font_02_sfnt_off00009b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B52 18976 bytes
SHA-256: c664a727bc63afe95aa7dc50ae0affa62569c795923088c4fc4e101631e2a335

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