Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42d04cd96f7c939…

MALICIOUS

PDF

41.5 KB Created: 2021-05-14 03:33:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d79ee9f542ff94df7f4beffb949c6cac SHA-1: 910fba79a4661e5b87bea63e36e451914cc95d6d SHA-256: c42d04cd96f7c939ae3fc50b58905f9d13122b5e0fc035a1abf0e1aac2571827
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free in-game currency, directing users to a malicious redirector URL. The ML classifier strongly flagged this PDF as malicious, and the embedded URL is associated with known malicious infrastructure. The document's content and embedded links suggest a phishing or scam attempt to drive traffic to potentially harmful sites.

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-to-get-free-spins-on-coin-master-hack-game-hack In PDF document text
    • http://www.ocic.hr/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ocic.hr/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.ocic.hr/files/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ocic.hr/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.ocic.hr/files/op-rewards-robux_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/how-to-download-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://www.ocic.hr/files/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • https://www.ocic.hr/files/coin-master-shield-hack_GM406889139.pdfIn PDF document text
    • https://www.ocic.hr/files/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://www.ocic.hr/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://www.ocic.hr/files/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://coinmasterspinandcoin.comIn 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_off00004772.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4772 24548 bytes
SHA-256: a263a33925075d3483798a6d3fd3e169129549fbebb781a68237313510ab0cf0
font_01_sfnt_off00007ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFA 18220 bytes
SHA-256: b9590c860e10d8f9c020beecb5b6ba48e280dd1fb7308b582b518c7b33ada2d7

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