Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cd393bcd7173e1…

MALICIOUS

PDF

43.5 KB Created: 2021-05-14 18:50:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7ed4ce22a08bdc8f68cb1b1df7a7bc3f SHA-1: 07e8c3f6cf27c0d65e68af2c3c2b26ce9332c58c SHA-256: f8cd393bcd7173e148cd9a3178383ffe03fbe59cbdae206a929324b3c12137b7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to a 'free generator' or 'game hack' website, designed to lure users into downloading further malicious content. The primary malicious URL identified is https://netcdn.xyz/app/406889139/coin-master-free-spins-hack-without-human-verification-game-hack. While no scripts were explicitly extracted, the document's structure and heuristic firings strongly indicate a phishing or social engineering attack aimed at delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-spins-hack-without-human-verification-game-hack In PDF document text
    • http://grugliascogiovani.org/images/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://grugliascogiovani.org/images/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://grugliascogiovani.org/images/coin-master-free-items_GM406889139.pdfIn PDF document text
    • http://grugliascogiovani.org/images/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://grugliascogiovani.org/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://grugliascogiovani.org/images/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • http://grugliascogiovani.org/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://grugliascogiovani.org/images/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://grugliascogiovani.org/images/get-robux-com_GM431946152.pdfIn PDF document text
    • http://grugliascogiovani.org/images/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://grugliascogiovani.org/images/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://grugliascogiovani.org/images/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://grugliascogiovani.org/images/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://grugliascogiovani.org/images/free-roblox_GM431946152.pdfIn PDF document text
    • http://grugliascogiovani.org/images/how-to-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://grugliascogiovani.org/images/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://grugliascogiovani.org/images/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://grugliascogiovani.org/images/minecraft-bedrock-client_GM479516143.pdfIn PDF document text
    • http://grugliascogiovani.org/images/games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://grugliascogiovani.org/images/coin-master-gold-cards-hack-english_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_off000047c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47C1 27096 bytes
SHA-256: ea9486fc6305d31e8df8ac159b09040ad1b94e6e71a64d0370effe147471f2ff
font_01_sfnt_off00008618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8618 18952 bytes
SHA-256: bbe995309b6761320a89de429a491d1b27525b5c8b766f3497e3cab7bbe78ffa

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