Malicious PDF — malware analysis report

Static analysis result for SHA-256 21db893a3c95e786…

MALICIOUS

PDF

41.9 KB Created: 2021-05-12 03:00:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ccd12cdb2e370a2fc59348f0b35f1c49 SHA-1: 01b9f77cf71f850d6d53eb653c2bc224633bf4f4 SHA-256: 21db893a3c95e7865e7901a8dc1e341a4ecc6ed247901bd276d7ff6c14abda41
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for popular games. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms a lure-based attack pattern. No scripts were extracted, but the document's structure and embedded links are designed to trick users into visiting potentially harmful sites.

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/earnrobux-game-hack In PDF document text
    • http://elektrofahrspass.de/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://elektrofahrspass.de/images/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/descargar-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/coin-master-fan_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • http://elektrofahrspass.de/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/roblox-free-hats_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://elektrofahrspass.de/images/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/can-i-have-robux_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/roblox-games-com-free_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
stream_003_off00004871.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4871 24980 bytes
SHA-256: 1f29019fdeb59db5d8cdbb2b438048c5a7dfc304813b131808772c6d8d24f25e
font_01_sfnt_off000081de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81DE 18076 bytes
SHA-256: 2721194a66b32dfdaea4e26ed0bd84b304de41eeda81871a4ffc347c5a8adb25

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