Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cb8b05e3dfe4e1…

MALICIOUS

PDF

35.2 KB Created: 2021-07-09 12:41:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 722fa3628cfa65be9d0169f97c947e84 SHA-1: 5398c026efffa4f5690a28a4cd24b0df2af7df37 SHA-256: 45cb8b05e3dfe4e12ad7438b3c1c5d728b4218bc49878f59037dcbf21001eff2
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are SEO-optimized to appear as game hack or free currency generators. The primary lure directs users to 'netcdn.tw', which likely serves as a redirector to further malicious content or scams. The document's structure and content strongly suggest it's part of a link farm designed to attract users searching for game exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/406889139/coin-master-daily-gift-free-spins-and-coins-link-game-hack PDF link annotation
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/free-robux-lebansay_GM431946152.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/pastebin-robux-hacks-for-free_GM431946152.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/free-robux-rbxplace_GM431946152.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/free-disney-plus-accounts-tiktok_GM835599320.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/how-to-hack-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/who-to-hack-pubg-uc_GM1330123889.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/how-to-get-the-roblox-madness-face-for-free_GM431946152.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/games-like-minecraft-but-free_GM479516143.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/coin-master-hack-iphone_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_off000031a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31A0 22912 bytes
SHA-256: 6073574ca48681618ef0743e63bfcc654832de0181837f75f4ea0bac7ef91e54
font_01_sfnt_off000064e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E0 18940 bytes
SHA-256: a6c8f3ff8a0dea06235968dd24959468b5e0dd7d526557991a378f144c82e936

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