Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4cb21610e35837…

MALICIOUS

PDF

45.1 KB Created: 2021-05-12 22:51:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 40fad25df09df6e7eae20dcf3fbc8dda SHA-1: 12b004dadcc09eb6b9cc283005687b2277903641 SHA-256: 4c4cb21610e358372b967836dd701dbfd1575be29e691a4eb3a1b7e426e4bc55
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and game hack lures, indicating a phishing or scam attempt. The heuristic firings confirm the presence of malicious redirector links and a lure for game hacks. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection, likely leading to a second-stage download or further phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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.xyz/app/406889139/coin-master-free-spin-and-coin-link-app-game-hack In PDF document text
    • http://gestibrok.com/images/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://gestibrok.com/images/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://gestibrok.com/images/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • http://gestibrok.com/images/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://gestibrok.com/images/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://gestibrok.com/images/how-to-hack-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://gestibrok.com/images/level-coin_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://gestibrok.com/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://gestibrok.com/images/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/roblox-e-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48A8 26328 bytes
SHA-256: 5b233b6dea670e284db3ef7a18d5bc0c2eb65caf885b549d272dbaf3318cc6a3
font_01_sfnt_off00008413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8413 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC5 18228 bytes
SHA-256: ab1c4cdc214a6baf81a15e2f62a40ea9cfbbbf407f0f3dd1c7564e467cf0dae2

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