Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a0827f5c6ac6cc…

MALICIOUS

PDF

42.7 KB Created: 2021-06-13 23:46:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6c15baf5dab7556963ce0b1e9afe4d18 SHA-1: 70b8d971b69e3444f998ab2082b56039d05fca04 SHA-256: 66a0827f5c6ac6ccf66a6fa52d6bc86a8e9c194ce25a4a637bb0cf7a2b6895f3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector, under the guise of offering free Robux or game hacks. The document body and embedded links strongly suggest a social engineering lure to drive traffic to potentially malicious content or downloaders. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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 http://netcdn.co/app/431946152/free-robux-codes-redeem-2021-game-hack In PDF document text
    • http://mklista.ru/images/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/how-to-create-group-in-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/free-800-robux_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/where-to-get-free-stuff-in-roblox_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/free-roblox-songs_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/coin-master-hack-reddit_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/free-supreme-shirt-on-roblox_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/how-to-get-free-mods-in-minecraft_GM479516143.pdfIn PDF document text
    • http://mklista.ru/images/install-free-game-coin-master_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/roblox-free-pets-in-pet-simulator_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/roblox-free-objet-hack_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/descargar-hack-para-hackear-cuentas-de-roblox-2021_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_off000047cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47CD 26032 bytes
SHA-256: c33f6cc5d430a7e1554092f66ba74f3e336846ed22d3646006ce64b4130def31
font_01_sfnt_off000082f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82F3 18852 bytes
SHA-256: 138fc3ce55a502739fe3cf6743b09b074df6c540152dcb15e1f5ac1b11592ffd

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