Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7f3c1d13aae54a…

MALICIOUS

PDF

45.3 KB Created: 2021-06-10 17:48:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e7545ede5377fd33e247ab0a5a0d6641 SHA-1: 0d0bafa4093ce5d92c2a147dee8df9ab053bc946 SHA-256: 4a7f3c1d13aae54ad582f628902faebfb51f3a29e405bcd817d091f561c863ac
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically targeting users interested in game hacks and generators. The ML classifier also flagged this PDF as malicious. The primary lure appears to be a 'free generator / game hack' which is a common social engineering tactic to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/how-to-use-cheat-engine-on-roblox-bee-swarm-game-hack In PDF document text
    • http://zercalo.org/images/como-hackear-roblox-2021-en-pc_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spin-links-december-30-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-hack-a-roblox-account-password-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-coin-master-account_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/pokemon-go-free-high-level-account-hack_GM1094591345.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_004_off000050cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50CC 25220 bytes
SHA-256: d47df5f11faabb652ba996f1d461fcb3456f6dc663eb6cc870cb72bf7a966efd
font_01_sfnt_off00008b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B78 19300 bytes
SHA-256: 3b9edc0c8f79ae74e044681a353f09656a1d944a4cc0866af628991cdea89c89

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