Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec8cd692cc7b4ad…

MALICIOUS

PDF

33.4 KB Created: 2021-07-07 21:57:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0afa3c72fd0f14d01c36a456481a4476 SHA-1: e6857c550ecc10e4ac2a9b36af9ab6cb36cc66a9 SHA-256: cec8cd692cc7b4adea7b99fd594e5de729b8ed857157f2044036a60a5510c84e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The embedded URLs and the document body content strongly suggest a phishing or scam attempt designed to lead users to further malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

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/coinmasterfreespins-game-hack In PDF document text
    • http://mbbs.hr/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/get-free-robux-at_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-deals_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-spins-coin-master-apple_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-without-being-scammed_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-invisible-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-car-in-car-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/estan-hackeando-roblox-13-08-19_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-without-human-verification-or-survey-or-offers_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-hack-reason-2-die-on-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
stream_002_off00002d96.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D96 22528 bytes
SHA-256: 401fd76e17aae82d0ce4dc6a2ca142665aeefb03a65519e22a741fd7a31285ca
font_01_sfnt_off00005fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBB 18272 bytes
SHA-256: 07d1048110b648044dfdf05b80b578e3dafb2e438d2dd29495699789e7328ffb

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