Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9ee8d8c605c949…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 14:31:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6726f2d0ad349c21e8f9d3866f40e191 SHA-1: 7942427aaf421923c986b9b9dd1de54809e2dbd0 SHA-256: fc9ee8d8c605c9493bd14d0a70e0101586e3f4095eee7d34be7b6173658ba9fa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirector infrastructure, specifically promoting 'game hacks' and 'free spins' to lure users. The primary malicious URL identified is http://netcdn.tw/app/406889139/stock-speed-coin-master-free-spins-game-hack. The document body and heuristics indicate a clear intent to redirect users to potentially harmful content, likely as part of a phishing or scam campaign.

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/stock-speed-coin-master-free-spins-game-hack In PDF document text
    • http://katalog.ireyogya.org/repository/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-outfit-maker-free_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/cheat-roblox-bubblegum-simulator_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/when-is-roblox-bloxburg-going-to-be-free_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-roblox-accounts-with-life-time-obc_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-hacks-2021-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/play-roblox-free-online_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/pastebin-com-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/www-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-make-a-roblox-skid-hack_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-free-followers-bot-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/www-roblox-com-play-for-free_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_off0000315d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x315D 23104 bytes
SHA-256: 0320490d0a689858a91ac6cd616abcba0997f3078f24672903a4542252218a59
font_01_sfnt_off00006573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6573 18520 bytes
SHA-256: a519bba55fcd2911d38b75876f0299d704b9845a8a755fb00f2a104f1f940b93

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