Malicious PDF — malware analysis report

Static analysis result for SHA-256 78af2f650d3583ca…

MALICIOUS

PDF

34.6 KB Created: 2021-06-24 23:30:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 547c9c1dea4436f89d8a2453593b4cd1 SHA-1: 2f522cffe7fb97c4322ad7cd438ad576fcdaac35 SHA-256: 78af2f650d3583ca6d32d91d8251dce11487407b6813d5377eda2cd31844c55e
160 Risk Score

Malware Insights

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

The PDF document contains lures for game hacks and free currency, directing users to a malicious redirector. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit user interest in online games to redirect them to potentially harmful content or download further malware.

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/cheats-on-roblox-2021-game-hack In PDF document text
    • https://kldcardio.ru/images/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • https://kldcardio.ru/images/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • https://kldcardio.ru/images/free-roblox-groups_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/paypal-roblox-hack_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://kldcardio.ru/images/free-robux-genrator-app_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://kldcardio.ru/images/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://kldcardio.ru/images/how-to-cheat-in-vampire-hunters-roblox_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/script-executor-free-roblox_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/roblox-tycoon-simulator-walkspeed-script-hack_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/roblox-anthem-hack-edition_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/roblox-for-free-on-ps4_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/how-to-get-your-hacked-account-back-in-roblox_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://kldcardio.ru/images/comment-hacker-des-map-roblox-roblox_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/hacks-en-csgo-roblox-en-espaol_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_off00002f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F1E 22616 bytes
SHA-256: 22be93fa4977622ee53d571a17de55521e0c03941ba1e1fdf7db34774d3690cb
font_01_sfnt_off0000619f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x619F 19160 bytes
SHA-256: afb1c2e2e7e86a3007394334b4e8cb150f1052dc6851fd976cf950434c0c10ec

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