Malicious PDF — malware analysis report

Static analysis result for SHA-256 50534d22b798e9ad…

MALICIOUS

PDF

42.2 KB Created: 2021-05-15 13:53:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 513638d52effbfcb8c9d027c538cbae3 SHA-1: 7092ab1049b914680cacc7f2464990ed44ef1f23 SHA-256: 50534d22b798e9ad4802ee0e1766c31c2fd68b4f13621a0c16d5a1f4293bacdb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that are flagged as malicious redirectors, specifically promoting 'free Robux' or 'game hacks'. These links likely serve as a lure to direct users to potentially malicious sites or to download further malware. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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/free-robux-script-game-hack In PDF document text
    • http://firstaidacademy.be/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/coin-master-hack-extension_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • http://firstaidacademy.be/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/krnl-download_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/free-rare-cards-for-coin-master-christmas_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/robux-xyz_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/free-coin-master-spins-blogger_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/coin-master-daily-spins_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48AD 24804 bytes
SHA-256: cb7a62361995ce8bcc62e78f59a449f44a96fdacbec6ad50383122bd5ec0193d
font_01_sfnt_off00008246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8246 18416 bytes
SHA-256: 7904477eb6282cb79bb1f8d95588be1a5283b3abf5667e30a4d761915d4b26ef

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