Malicious PDF — malware analysis report

Static analysis result for SHA-256 72421e1ddc6b4b41…

MALICIOUS

PDF

48.0 KB Created: 2021-05-17 02:05:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 87b6ced32f9bc61450e7438ea92803f8 SHA-1: 7d6bec95ba9b4cf608a6095cb1611a393c0fdd1d SHA-256: 72421e1ddc6b4b4192a16547cfc4ee0dc8bf92fd3dab8058d8c9bf34f9dda0a6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free spins' for games like Coin Master. The embedded URLs and the document body text strongly suggest a phishing or scam attempt designed to lure users to malicious websites. While no scripts were explicitly extracted, the PDF structure and heuristics indicate malicious redirection is the primary function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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-daily-free-spins-haktuts-game-hack In PDF document text
    • http://kukuck.de/images/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/robux-website_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/100-robux_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/wurst-18-9_GM479516143.pdfIn PDF document text
    • http://kukuck.de/images/coin-master-home_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/free-robux-real_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/hack-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/hacked-client-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://kukuck.de/images/free-robux-link_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/coin-master-hacks-iphone_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/coin-master-time-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000483a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x483A 24572 bytes
SHA-256: 53252afb2ddb57d904fe3e25e5f2e133759abfbd592f1021a7d0b3a21e1fc0ae
font_01_sfnt_off00008077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8077 4028 bytes
SHA-256: a17c2a746d49ac23b23e38a371e32fddecfcd91b10cf42ff6155bff6b8a07e91
font_02_sfnt_off00008e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E17 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off00009806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9806 18620 bytes
SHA-256: fb152ca50fe850c571f6e3814e594dc8907a27263d0d36506419ff2694520b64

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