Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a261544d05a736d…

MALICIOUS

PDF

35.0 KB Created: 2021-06-19 10:27:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 67d2c7cd1de270f4b5ad45d24cfdf861 SHA-1: f8e462b27f7e60d164461d685c21b3d85779cfed SHA-256: 4a261544d05a736ddf027d0ab0bc9fbd32c9f6c949dcbeaf6ff3407818bf68cb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for free game currency ('Robux') and directs users to a malicious redirector URL. This URL is associated with known malicious infrastructure, indicating a phishing or scam attempt. The ML classifier also flagged this PDF as malicious with high confidence.

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.co/app/431946152/how-do-you-get-free-robux-2021-game-hack In PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/jailbreak-roblox-hack-money-2021_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/paste-bin-dab-hack-script-roblox_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-get-2021-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/hack-para-case-clicker-roblox_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/give-free-robux_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-villages_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-appsfor-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/earnrobux_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/earn-robux-online-free_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_off00003006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3006 22260 bytes
SHA-256: 2915178e2306b04200d71567b7f818e61834acfe5562fb6d18c480a643d3351c
font_01_sfnt_off0000616a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616A 19716 bytes
SHA-256: 0d2f3942e55245e7a14fdb54ac7cb42d00cb555bb8e9738c839b3f9835dfd221

Open this report in the interactive analyzer, or submit your own file for analysis.