Malicious PDF — malware analysis report

Static analysis result for SHA-256 738ffec56a091f3c…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 13:14:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 70a9ca99ae936da4084018a148153688 SHA-1: 78cbbe242b49eb24ee7aabccd9a614bd9e6d83f0 SHA-256: 738ffec56a091f3c4560c7710c3cafb4c84abcdb911c06e522d8817e9f6f80c6
160 Risk Score

Malware Insights

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

This PDF document employs a lure for free game items and hacks, containing multiple links to a known malicious redirector. The primary malicious link is http://netcdn.tw/app/406889139/80-free-spins-coin-master-game-hack, which is designed to lead users to further malicious content. The presence of embedded links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

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.tw/app/406889139/80-free-spins-coin-master-game-hack In PDF document text
    • http://www.donjastubica.hr/files/how-do-you-get-free-robux-on-roblox-ipad_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-to-download-speed-hack-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-knife-codes-roblox_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/robux-money_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/roblox-cheat-engine-64-codes_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/win-free-robux_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://www.donjastubica.hr/files/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://www.donjastubica.hr/files/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/roblox-cheats-for-robux-pc_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/hacker-of-roblox-that-log-into-your-account_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/coin-monster_GM406889139.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_002_off00003083.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3083 23104 bytes
SHA-256: 773494ac382c9b517eca127781a6826303e46be9ce0a6a27709396b1db273e3d
font_01_sfnt_off00006483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6483 18556 bytes
SHA-256: 6aca12d1c5311c20ad8447472a8f74efe8546887157b26755d8bdae78e98e7b0

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