Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4b1b220396ae1b…

MALICIOUS

PDF

41.8 KB Created: 2021-05-12 08:01:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 399790e1884aa5287793544b2aa25321 SHA-1: ef0b2de9f52bfd9514d55fed06e9ec72c4ae767e SHA-256: 1d4b1b220396ae1b37f5f7f3973f332e08cd6fc9739ac265f8d86c55fa830f4b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with themes like "Coin Master Hack" and "Robux Generator". The embedded URLs, such as https://netcdn.xyz/app/406889139/coin-master-hack-apk-android-game-hack, are associated with malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristics indicate a malicious redirector workflow, likely intended to lead users to phishing or malware download 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/406889139/coin-master-hack-apk-android-game-hack In PDF document text
    • http://bau-lk.de/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://bau-lk.de/images/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://bau-lk.de/images/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • http://bau-lk.de/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://bau-lk.de/images/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://bau-lk.de/images/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • http://bau-lk.de/images/coin-master-apk-hack-3527_GM406889139.pdfIn PDF document text
    • http://bau-lk.de/images/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bau-lk.de/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://bau-lk.de/images/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • http://bau-lk.de/images/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://bau-lk.de/images/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://bau-lk.de/images/como-hackear-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://bau-lk.de/images/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://bau-lk.de/images/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • http://bau-lk.de/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://bau-lk.de/images/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://bau-lk.de/images/free-spins-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • http://bau-lk.de/images/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://bau-lk.de/images/robux-gratis_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_off000044b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x44B8 26796 bytes
SHA-256: 5fb35c244a32a7e98091f550e11b12c95b27dbf57549fcca81c1004538bb0a1f
font_01_sfnt_off000081a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81A8 18068 bytes
SHA-256: 826b659b6d6a919198e40a4f05f943b2342615ea87152df5852563aa56c598f0

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