Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63e8d650508300b…

MALICIOUS

PDF

42.2 KB Created: 2021-05-14 23:57:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e747117b0462da6ca61b3b057a789b24 SHA-1: 775830bf16d48baa634bb60ac118568f0937103e SHA-256: c63e8d650508300bb3ee59281dd6cd413c5adb6a3f72a090f9455c2c0b332274
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to domains associated with malicious redirectors and lures for game hacks and free rewards. The presence of a visual download button and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or initiate further downloads. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/rewards-robux-game-hack In PDF document text
    • http://e-mailservis.cz/images/coin-master-online-hack-link_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-robux-co_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/static-moonactive-net_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://e-mailservis.cz/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/coin-master-daily-spins_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/coin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/robuxmatchcon_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-minecraft-mods-for-pc_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_003_off000047a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47A3 25384 bytes
SHA-256: 6bfc27491ff66b58f595f0e92ec922f0ee83af69cc1a4cb4eb1341681e706460
font_01_sfnt_off00008209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8209 18416 bytes
SHA-256: 21116ea904a611fad18bc85f00e00e8b2c3853fc9714ecb701cf7760588061a1

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