Malicious PDF — malware analysis report

Static analysis result for SHA-256 48cdddd4ea0df4cf…

MALICIOUS

PDF

35.6 KB Created: 2021-07-04 20:40:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e605969e09b3ab37e0088fd44e3d745f SHA-1: b29c83e7590b299dc861e5ea901f674aad4f8534 SHA-256: 48cdddd4ea0df4cf9da7383086a7c216b0fda95f1836a4c0f15eb54682cccadb
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 0.9980

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.tw/app/431946152/get-free-robux-without-human-verification-game-hack PDF link annotation
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-roblox-songs-mp3_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/minecraft-thumbnail-maker-free_GM479516143.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/roblox-mega-fun-obby-cheats_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-roblox-noob-gameplay_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/claire-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/roblox-walk-through-walls-cheat-engine-jailbreak_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/roblox-hack-android_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/redem-code-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-robux-generator-2021-gaming_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/booga-booga-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-spins-and-coins-com_GM406889139.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/how-to-get-free-robux-for-kids-on-a-ipad_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-account-roblox-with-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
font_00_sfnt_off00003104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3104 22896 bytes
SHA-256: 195493239d1cfaa3e5bbc46aaecd8f3dec0004af2984c39b0a044c53c3cc2c91
font_01_sfnt_off0000643b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x643B 19700 bytes
SHA-256: e8bf7ca05401f798ebc0703cbcc09d220ccc7d22796280ca6a3dd60c700d0f91

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