Malicious PDF — malware analysis report

Static analysis result for SHA-256 83720ddd1129ee25…

MALICIOUS

PDF

50.9 KB Created: 2021-05-17 06:32:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3358e099507044f018ba3959dcc9a8c1 SHA-1: d58487d6f04e53e641ff1877814d16e0fa4a2c08 SHA-256: 83720ddd1129ee252c5631e53432bed6c7f2c0b26d467fa3c99753217920f726
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with 'free generator' or 'game hack' themes, indicating a phishing or malware distribution attempt. The embedded URLs, such as https://netcdn.xyz/app/431946152/free-robux-no-anti-bot-verification-game-hack, are designed to lead users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9348

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 https://netcdn.xyz/app/431946152/free-robux-no-anti-bot-verification-game-hack In PDF document text
    • http://apd-ukraine.de/images/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://apd-ukraine.de/images/robux-download_GM431946152.pdfIn PDF document text
    • http://apd-ukraine.de/images/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • http://apd-ukraine.de/images/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://apd-ukraine.de/images/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://apd-ukraine.de/images/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://apd-ukraine.de/images/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdfIn PDF document text
    • http://apd-ukraine.de/images/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://apd-ukraine.de/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://apd-ukraine.de/images/hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://apd-ukraine.de/images/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://apd-ukraine.de/images/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://apd-ukraine.de/images/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://apd-ukraine.de/images/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://apd-ukraine.de/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://apd-ukraine.de/images/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://apd-ukraine.de/images/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://apd-ukraine.de/images/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://apd-ukraine.de/images/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://apd-ukraine.de/images/free-spins-coin-master-without-completing-offers_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ae3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AE3 33916 bytes
SHA-256: cf9c276983850f42d50de4499229e4e0f33c4e72423b0073ce3d10a583db703c
font_01_sfnt_off000099f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99F1 2908 bytes
SHA-256: e28d2c57f35643e2026f86c34ac3bb63cba74be3f6c066e81aba6d285e5a121b
font_02_sfnt_off0000a3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3EA 18600 bytes
SHA-256: 8cfd8c2479ee29cd4f6dba9b0ab7f96f8a0f4a4bb194f6119df547073888af7b

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