Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4c271b2c011aa1…

MALICIOUS

PDF

36.8 KB Created: 2021-07-05 15:18:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 106091a591833bca39b2e52b318575e6 SHA-1: 6cf37a28b36d9d5cea84516ac7b69c1f972d8c05 SHA-256: ab4c271b2c011aa1d7261341cd06c644b15de008eddd984a9262f3d6f5fc9da0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/how-to-get-free-robux-on-pc-2021-game-hack. This lure is designed to trick users into believing they can obtain free game currency or hacks. The presence of numerous similar links suggests a phishing or scam campaign. No scripts were extracted, but the document's structure and embedded links indicate a malicious intent to redirect users to potentially harmful sites.

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/how-to-get-free-robux-on-pc-2021-game-hack In PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/rbx-robux_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/hack-coin-master-for-android_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/free-spins-coinmaster_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/google-how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/rbx-claim_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/if-sombody-cheats-in-roblox-what-do-you-do_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/husky-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/hacks-roblox-car-radio-codes_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/rbx-free_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/free-robux-code-genorator_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/get-free-roblox-right-this-second_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/free-roblox-hats-2021_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_off00003731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3731 22508 bytes
SHA-256: 2f6f010b68d0686109dec0aad87cfa8479d050e81848f0476838699860fbeed0
font_01_sfnt_off0000695c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x695C 19540 bytes
SHA-256: 02eafea25953af9a63d79e6d680b7a7dbb3ecddaffc247a3129342a1978cb967

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