Malicious PDF — malware analysis report

Static analysis result for SHA-256 6874f73319b6b0b1…

MALICIOUS

PDF

34.4 KB Created: 2021-07-06 07:42:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c461662eaea7211f94e6077ec0062972 SHA-1: 0178da06f3502609f5511b2e6911a268643016c6 SHA-256: 6874f73319b6b0b1a835dd7fa433060d5fdc0afd5d79776e6cb0e1a76828d5a7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to a known malicious infrastructure, specifically advertising 'Coin Master Free Spins' and game hacks. The document body and heuristics indicate a lure designed to trick users into clicking these links, likely leading to further malware downloads or phishing pages. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-spins-no-generator-game-hack In PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/black-adidas-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/unlimited-robux_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/comment-installer-un-cheat-sur-roblox-bulble-gum_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-scripts-roblox_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-minecraft-client_GM479516143.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-gear-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-execute-localscripts-on-roblox-hack_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/roblox-pink-free-robux_GM431946152.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_002_off0000320c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x320C 22472 bytes
SHA-256: f80cff1d94fb01edd4d79d984d2a9282d4b1823b85ddef8dfa2dfc935a0b0fa2
font_01_sfnt_off00006421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6421 18176 bytes
SHA-256: 77c96ce1f1240076ebae8e0b9f71290cf4df32d1dbcc09d34a4bb131e3b5cb60

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