Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b5c19897d04142…

MALICIOUS

PDF

33.9 KB Created: 2021-07-19 10:31:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 73fa792b5be7c6557d7bd28850f15290 SHA-1: e35d63400b964cd9272301900ffe0c11eca63440 SHA-256: f3b5c19897d04142273df950b998dd985fd8f2ff68cc46e7d295f116afe39050
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links to known malicious redirectors and lures users with promises of free Robux or game hacks. The embedded URLs, such as http://netcdn.tw/app/431946152/free-robux-generator-2021-game-hack, are designed to lead victims to potentially harmful websites. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this file is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://netcdn.tw/app/431946152/free-robux-generator-2021-game-hack In PDF document text
    • http://kfz-service-etp.de/images/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://kfz-service-etp.de/images/how-to-get-followers-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://kfz-service-etp.de/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://kfz-service-etp.de/images/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://kfz-service-etp.de/images/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://kfz-service-etp.de/images/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://kfz-service-etp.de/images/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://kfz-service-etp.de/images/free-tiktok-likes-no-human-verification-or-download_GM835599320.pdfIn PDF document text
    • http://kfz-service-etp.de/images/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://kfz-service-etp.de/images/minecraft-xray-hack_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
font_00_sfnt_off00002e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E6E 22572 bytes
SHA-256: 96fb4cedd66307147e083457c3d19c80f85ae075817973d492f4f4b3430e5a41
font_01_sfnt_off00006092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6092 18932 bytes
SHA-256: 288497dc670faabfd1d4398203f590008d69da3c72e2d18292344acf0c598d91

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