Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7712183eadc7cf…

MALICIOUS

PDF

35.3 KB Created: 2021-07-09 07:11:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 889de329a9faa1a3831f5eacc29f5b93 SHA-1: 288dc95a8f74d2a399a3761b315a7beddc574464 SHA-256: 5b7712183eadc7cf73973104e8ea31bbaf2fc49bbc8e43bbf640951e23eb0cc2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free game currency or hacks, indicating a phishing or malware distribution attempt. The embedded URLs, such as http://netcdn.tw/app/431946152/free-robux-no-human-verification-or-survey-2021-game-hack, are designed to lead users to potentially harmful sites. The document's structure and content strongly suggest it is part of a social engineering campaign to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-no-human-verification-or-survey-2021-game-hack In PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/hack-roblox-now_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/hack-coin-master-for-iphone_GM406889139.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/coin-master-link-app_GM406889139.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/tiktok-free-like-and-followers_GM835599320.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/roblox-team-switch-hack_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/how-get-free-robux-glitch_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/free-accounts-roblox-2021-live_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/sites-to-get-free-robux_GM431946152.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_off00003132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3132 21960 bytes
SHA-256: 54a6de9d4ac7acaf6b569556b7917af7adbe36eb545f026796e53137bce6f125
font_01_sfnt_off00006205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6205 20028 bytes
SHA-256: a686843967d16d630a3d792aecd0df7810ef9440d33d67b3fe7886ce86e787de

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