Malicious PDF — malware analysis report

Static analysis result for SHA-256 31cb86275981294b…

MALICIOUS

PDF

41.7 KB Created: 2021-05-19 09:04:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9bf0d211061e81ec26dc58709a0ec450 SHA-1: f58c39dded47627e8e9712b965dec1835fbf68c3 SHA-256: 31cb86275981294b433075dfb2f3fe316be8e75e183a836161a13d1fcbc366a1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'game hacks' and 'free coins'. The primary lure URL is https://netcdn.xyz/app/406889139/how-do-i-get-free-coins-on-coin-master-game-hack, which is part of a chain of redirects. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting potentially harmful sites, likely for further malware delivery or credential harvesting.

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/how-do-i-get-free-coins-on-coin-master-game-hack In PDF document text
    • http://carmen-duran.com/images/coin-master-hack-android-root_GM406889139.pdfIn PDF document text
    • http://carmen-duran.com/images/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://carmen-duran.com/images/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://carmen-duran.com/images/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://carmen-duran.com/images/coin-master-freebies_GM406889139.pdfIn PDF document text
    • http://carmen-duran.com/images/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://carmen-duran.com/images/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://carmen-duran.com/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://carmen-duran.com/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://carmen-duran.com/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://carmen-duran.com/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://carmen-duran.com/images/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • http://carmen-duran.com/images/coin-master-2021-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://carmen-duran.com/images/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • http://carmen-duran.com/images/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • http://carmen-duran.com/images/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://carmen-duran.com/images/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://carmen-duran.com/images/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://carmen-duran.com/images/minecraft-free-android_GM479516143.pdfIn PDF document text
    • http://carmen-duran.com/images/coin-master-free-spins-2021-today_GM406889139.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_003_off000048b6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48B6 24584 bytes
SHA-256: a20a4dde8920a7ab82d480d9497e7ce66bb31e75ba1d0a27c1123ed0b625cd77
font_01_sfnt_off0000814f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x814F 18044 bytes
SHA-256: b0174b7273dd3697a995ce39da4c1069e2dc5f33a377c5b822b1ade397e01d0c

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