Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8297aed527778f…

MALICIOUS

PDF

35.8 KB Created: 2021-07-06 08:24:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a8405fc5e5d8a965a99791df275a5e1d SHA-1: 976244c9b326f68ce048c06db319d0424287604d SHA-256: cd8297aed527778f6db400f8e42d933c37186feff1fb7b2510b7d6178ca20d08
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which in turn hosts multiple other malicious PDF files. The document body and heuristics indicate a clear intent to redirect users to potentially harmful content, likely for further exploitation or malware delivery.

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/free-daily-spins-from-coin-master-game-hack In PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/minecraft-116-free_GM479516143.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/wurst-client-download_GM479516143.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/roblox-hack-v30rar_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/free-roblox-accounts-with-robux-v3rmillion_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/free-robux-offers_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/lua-hack-client-roblox_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/roblox-free-robux-hackers_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/como-tener-anti-gravedad-en-roblox-hack-check-crashed_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/roblox-free-script-executor-2021_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/roblox-free-black-suit_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/how-to-hack-in-roblox-prison-life-no-virus_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/free-robux-no-survey-2021_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/www-roblox-com-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_off0000349b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x349B 22860 bytes
SHA-256: ac8a87e86897eabd20a9390f29327f4a3c88550062a8b467d34dee613ddbedb1
font_01_sfnt_off000067c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67C5 18856 bytes
SHA-256: d310d8b42a9db28f952d6c808dbfd2c0798e16e205ce104a4cdcfe428c53c924

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