Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e8d83ebd11bc9c…

MALICIOUS

PDF

46.0 KB Created: 2021-05-12 10:46:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 46356ddcd62ca379e0849a8969fe6ef7 SHA-1: f35e80d7dc0fd31cda039f4724a6bac5558d4745 SHA-256: 21e8d83ebd11bc9cdaf9efbc86886328ab1b71c34db78ffa860e5d00150cb767
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free spins' for popular mobile games. The primary redirector URL identified is https://netcdn.xyz/app/406889139/coin-master-free-spins-link-today-new-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate a social engineering lure designed to drive traffic to potentially harmful websites, likely for further malware delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/406889139/coin-master-free-spins-link-today-new-2021-game-hack In PDF document text
    • https://www.devries-group.de/images/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/roblox-com-hack_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/coin-master-free-shield_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • https://www.devries-group.de/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://www.devries-group.de/images/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/install-coin-master_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • https://www.devries-group.de/images/roblox-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.devries-group.de/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/coin-master-daily-free-spins-link-app-download_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_off00004be3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BE3 25156 bytes
SHA-256: a5528b238b5eac49abd078aa21d1b13d5f7a1a4d3928e9957f26da1a93e5fb1c
font_01_sfnt_off000084e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84E6 2932 bytes
SHA-256: 6a728a9066ba65435d6380d78d87d8ee4d5553deba8217e5dee5b64eeb83287d
font_02_sfnt_off00008f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F0D 18976 bytes
SHA-256: 9ab4b87832590d82aec569b9c8693c2016d5d9151569e528de1ed13ad8a1cb2c

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