Malicious PDF — malware analysis report

Static analysis result for SHA-256 db185ed7cc21d0e0…

MALICIOUS

PDF

42.9 KB Created: 2021-06-14 00:53:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 45f488a599c9190bd1c4699ea66c7578 SHA-1: d67d5b1e75b588684c34e80383b90caa722987ee SHA-256: db185ed7cc21d0e0001b5ecb60e999cb2b825c8f5455a317e9966ca907477634
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.co/app/431946152/free-roblox-account-username-and-password-game-hack PDF link annotation
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-new-cards-hack_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/spin-link_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-hack-apk-android-1_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/minecraft-toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-800-robux_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-rewards_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-hack-without-human-verification-india_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-skull-free_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-game-hacks_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-robux-generator-simulator_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-hack-apk_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
font_00_sfnt_off00004ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AC9 24436 bytes
SHA-256: 77df31701c093e87a77321fedbea2e84f2b91c6b19dc0db39ab65703818985a8
font_01_sfnt_off000081ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81EE 19356 bytes
SHA-256: 737add010f69459d2f6a68613583cce3be6c10ca4cdfa6c1e0c6b46ae89b05b2

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