Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac08b756f003fa3…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 12:28:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a52cc81aab9e4ef9ce11a46bf50ab8e5 SHA-1: edadc4a4402dc0ec2978d2f4fafb9127e05e00b6 SHA-256: 1ac08b756f003fa3d1c2edd7ea771eb97d22943eb66af3cf80376d408602ca60
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, including one at http://netcdn.tw/app/431946152/roblox-promo-code-to-get-free-robux-game-hack, which is likely a lure for users seeking in-game advantages. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and a call-to-action heuristic further supports a malicious intent to redirect users to potentially harmful content. No scripts were extracted from this sample.

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/roblox-promo-code-to-get-free-robux-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coin-master-spins-link-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/grabpoints-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-be-a-roblox-admin-for-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/tiktok-free-vpn_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-hackaron_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/stock-speed-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-only-1-step_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_off00002fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FCB 22140 bytes
SHA-256: 8bdc263b87a1d34b42e552273a0cb394f7510fd7faa1d274bf6f60a5086100e6
font_01_sfnt_off00006124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6124 19480 bytes
SHA-256: 9c60ac484ed4d96c21d417994060880eaf1182fdd7210cd7b39094265f956726

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