Malicious PDF — malware analysis report

Static analysis result for SHA-256 982631d8eabb2c24…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 02:38:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 28e5d200b8f481ffc6300de570064a25 SHA-1: f13de26de440b55bc8920d72fc25e2b176259df6 SHA-256: 982631d8eabb2c24a2ada7b8bd736da49feb1ad82969c3189e143b6326edcdf0
82 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs that redirect to websites offering 'free generators' or 'game hacks', a common lure for malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to external resource exploitation. The primary URL, http://netcdn.tw/app/835599320/free-tiktok-likes-no-human-verification-or-downloading-apps-game-hack, is likely the initial landing page for a phishing or malware distribution campaign.

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/835599320/free-tiktok-likes-no-human-verification-or-downloading-apps-game-hack PDF link annotation
    • http://htbrasil.net/ckfinder/userfiles/files/hack-script-roblox-games_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/how-to-get-free-robux-2021-2-4_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/robux-hack_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-robux-roblox-com_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-robux-2021-insoect_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-minecraft-domain_GM479516143.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/cheats-para-roblox_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/cheat-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/roblox-mad-games-aimbot-hack_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/8rsh-roblox-jailbreak-free-vip-server_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/tiktok-free-fans_GM835599320.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/roblox-hack-btools-2021_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/hacks-para-jailbreak-roblox-2021_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-free-cards-link-2021_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
font_00_sfnt_off00003129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3129 21708 bytes
SHA-256: 3bcbe383f6148699b26e29cd71e1215ec3b5b5062f7506b8af52b9719fcccec3
font_01_sfnt_off000060eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60EB 19260 bytes
SHA-256: 26817b4cedfa85687dbcd5cd5fe0b6768af480ef1d18351329c732120202e544

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