Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cfd3a6e9ca93fe…

MALICIOUS

PDF

44.5 KB Created: 2021-06-10 14:51:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1b69adc4725774b59c9bbd2f6cb7e1ae SHA-1: 872ad13e0b5467746d2851e2f5e8f72921c40f66 SHA-256: a4cfd3a6e9ca93fece0597d635aef361143bf33e2ac64f132e42b05e75a9f2d5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games like Roblox. The primary lure URL is https://netcdn.tw/app/431946152/roblox-hack-jhon-doe-game-hack, which is part of a chain of redirects to other malicious domains. The document body, though heavily obfuscated, contains references to these lures and the wkhtmltopdf authoring application, suggesting it was generated to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/roblox-hack-jhon-doe-game-hack In PDF document text
    • https://labdagatismk1pundong.com/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.labdagatismk1pundong.com/repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.labdagatismk1pundong.com/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://www.labdagatismk1pundong.com/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.labdagatismk1pundong.com/repository/free-roblox-hair-girl_GM431946152.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • https://www.labdagatismk1pundong.com/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.labdagatismk1pundong.com/repository/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.labdagatismk1pundong.com/repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/roblox-comroblox_GM431946152.pdfIn PDF document text
    • https://www.labdagatismk1pundong.com/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://www.labdagatismk1pundong.com/repository/free-robux-master_GM431946152.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/free-500-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://www.labdagatismk1pundong.com/repository/how-to-get-minecraft-java-for-free_GM479516143.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_004_off000051b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B3 24624 bytes
SHA-256: 12945ada1df6a0092f0f6f9c52c7b5c528bdfea501667886d798dc7be471eafa
font_01_sfnt_off00008a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A18 18680 bytes
SHA-256: 4c6422ec0c4c69f033e97bd821bffc788afb99d4c63283581b4c4f0f176382ea

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