Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7874633d08f7df…

MALICIOUS

PDF

47.3 KB Created: 2021-06-10 17:33:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 883c784a5eb2fc4dacdf306824678460 SHA-1: 475a8e5fec8a14344fbd3a16a2221deea5cae9c1 SHA-256: 5c7874633d08f7df6b4936f4eeeeaf16a62bc0e2fd65cffa0f4cb44db1539a65
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized and advertise hacks or free in-game currency for popular games. The presence of a 'download button' lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. The document's structure and numerous external links suggest it is part of a link farm designed to attract users searching for game cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 https://netcdn.tw/app/431946152/roblox-console-hack-robux-game-hack
    • https://bioscience.kyst.com.tw/image/data/files/free-robux-app-2021_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-hack-without-human-verification-2021_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-coin-link_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/is-windows-10-minecraft-free_GM479516143.pdf
    • https://bioscience.kyst.com.tw/image/data/files/how-often-pubg-uc-advance_GM1330123889.pdf
    • https://bioscience.kyst.com.tw/image/data/files/free-roblox-animations_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-daily-free-spins-link-download_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-free-robux-inspect_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/roblox-hack-me_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/minecraft-client-download_GM479516143.pdf
    • https://bioscience.kyst.com.tw/image/data/files/free-spins-coin-master-daily_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-hack-apk-download-2021_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-fan-page-free-spins_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-free-robux-without-surveys_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-links-for-free-spins-2021_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-hack-tool-no-survey_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-free-spins-hack-ios_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/how-to-give-free-robux-to-friends_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-coin-master-spin_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/haktuts-coin-master-free-spin-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005115.bin
3ef763aa357d965ccb3b5eff3729d2486af9bede65f02d23c8c80328d8a8def6
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5115 31520 bytes
font_01_sfnt_off0000966f.bin
576b1932ba15ba5e5b00768006dbc04f96fd41f50e23781e966c44a247df9162
pdf-font-stream PDF embedded font (sfnt) at offset 0x966F 18320 bytes