Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4243dcf14b647d…

MALICIOUS

PDF

40.8 KB Created: 2021-05-15 14:12:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bb6383781749072eb01c7723635e462b SHA-1: a12cdf0e16f63cb0ef205c1249a487298f29a6b7 SHA-256: ca4243dcf14b647dc203b46ad0860d4dd7c39b7ed5209c3ba1654106abf99524
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and websites advertising game hacks and free currency. The document body, though partially corrupted, contains references to 'Coins Master' and URLs that align with the heuristic findings. The primary attack pattern involves luring users to potentially malicious external sites via deceptive links.

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 https://netcdn.xyz/app/406889139/coins-master-game-hack In PDF document text
    • http://gestibrok.com/images/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/www-rubux_GM431946152.pdfIn PDF document text
    • http://gestibrok.com/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • http://gestibrok.com/images/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://gestibrok.com/images/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • http://gestibrok.com/images/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://gestibrok.com/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/arsenal-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://gestibrok.com/images/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://gestibrok.com/images/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://gestibrok.com/images/hacks-master-coin_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/coin-master-coin-link_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/level-coin_GM406889139.pdfIn PDF document text
    • http://gestibrok.com/images/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://gestibrok.com/images/free-girl-hair-roblox_GM431946152.pdfIn PDF document text
    • http://gestibrok.com/images/coin-blogspot_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000481c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x481C 24088 bytes
SHA-256: deaa48f08fdefb4d4da58273eface3c82a965970a618f6b04340e0c3902c6dfb
font_01_sfnt_off00007f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F10 17544 bytes
SHA-256: c9bcf992f56036f7990d1d97856b1a720a277248fb627b4b4849cf1459fc1402

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