Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ccce038011afb06…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 18:39:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: efc0bf9d65a74a7041f2ccd0766258a7 SHA-1: 310be1659b37698da9a668e779133923f8f01d13 SHA-256: 6ccce038011afb06efee7f39d260e0434f529310072afaac96c739bd20aa95a0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector, disguised as generators for game currency or hacks. The ML classifier also flagged this PDF as malicious. The primary malicious link identified is https://netcdn.online/app/406889139/coin-master-free-cards-game-hack, which likely leads to a further malicious download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-free-cards-game-hack In PDF document text
    • https://www.wcauk.org/uploads/files/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-hack-apk-online_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-spin-coin-master-app-download_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-roblox-card-codes_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-hack-here_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/minecraft-free-download_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-cards-free-cards_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-free-link_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_004_off00005007.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5007 24792 bytes
SHA-256: 85ae906e4180950a1530266b44ad784a951a656c6ed8cea57c70d095863f6361
font_01_sfnt_off00008903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8903 17884 bytes
SHA-256: dce98ab1a9f6331dfaabbdd57dacdba92c66b57249d10e9c2a1df39138c2a47b

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