Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1b78aa9f56a6a4…

MALICIOUS

PDF

34.7 KB Created: 2021-06-27 18:40:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 055190f29cc7ace0328c3ef35477bae9 SHA-1: aab48a1c49eed9c5e0e878f4305396328211508b SHA-256: 4c1b78aa9f56a6a4e4502a491700675ff203996a4bf4b1ce3a594d210e0ee43a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as "free generator" or "game hack" content, which is a common lure for phishing or malware distribution. The document body and heuristics indicate a clear intent to redirect users to potentially harmful websites. No scripts were extracted, but the embedded URLs and heuristic firings strongly suggest a malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/how-to-get-rogue-lineage-for-free-roblox-game-hack In PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-hack-roblox-hospital-roleplay_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-hack-apk-iphone_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-cheat-on-roblox-got-talent_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-roblox-full-lua_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/what-is-wurst_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/every-free-item-since-2021-roblox_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
font_00_sfnt_off000030b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B2 22192 bytes
SHA-256: c3c6c46e0693f45f704708c1e6b90d989ee7320cfeb61925ecc49e5181e584bf
font_01_sfnt_off000061fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61FB 19180 bytes
SHA-256: 511c9f6aefdb6c22bdaac3b264411ebcd12ea21efcf96d6266f30a20f307a420

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