Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fa3daa613738a8…

MALICIOUS

PDF

33.9 KB Created: 2021-07-06 15:58:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f67e0b298b7ff6ebdcd75b914bc9e448 SHA-1: c8f886d090d323ab253290bf64014fc03a408fb3 SHA-256: b2fa3daa613738a80b4ab1295cbb8ea6b95eb31d21e219de2b27afd90de4a73f
160 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically advertising game hacks and generators. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and 'PDF_MALICIOUS_REDIRECTOR_LINK' strongly indicate a social engineering attempt to trick users into visiting a potentially harmful site. While no scripts were extracted, the document's structure and embedded URLs suggest it's designed to lead users to a malicious download or exploit page.

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/406889139/coin-master-coins-hack-game-hack In PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/roblox-free-robux-free-hack_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/roblox-deathrun-hack-script-money_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/can-you-hack-robux-in_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/tiktok-free-or-not_GM835599320.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/roblox-speed-hack-mega_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/roblox-get-free-robux-game_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/static-moonactive-net_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-roblox-dump-account-june-2021_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/roblox-hack-bars-2021-for-pc_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/robux-free-co_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
stream_002_off000030c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30C1 22540 bytes
SHA-256: cc74e10c45e672f1035f3dc7b8c8ddcc53de4ff9fccc887bfe58edf93b2c477a
font_01_sfnt_off000062b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B1 18004 bytes
SHA-256: 2f3a5855c5bac228d8d27cc7f61b57eebad79d58a924e470a0477843dff273c7

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