Malicious PDF — malware analysis report

Static analysis result for SHA-256 04810172e546638a…

MALICIOUS

PDF

53.7 KB Created: 2021-06-03 07:57:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ae2151704642d75dddf20407efe50324 SHA-1: 1d5696aa7325909d4ab543cd5873d9526d71dd26 SHA-256: 04810172e546638a28b930cbca6ca5ac83164f2b2bbd093e88f176c5e0479f33
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a LOLBin command-execution lure. 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 0.9491

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.online/app/431946152/roblox-hack-app-game-hack PDF link annotation
    • http://rivne.media/ckfinder/userfiles/files/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/free-coins-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/robux-xyz_GM431946152.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/coin-master-spin-link-2021_GM406889139.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/rbx-roblox-robux_GM431946152.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/websites-for-robux_GM431946152.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/free-minecraft-bedrock-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://rivne.media/ckfinder/userfiles/files/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053b9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53B9 29120 bytes
SHA-256: dd105f5b830463add1cc5b8dab59b461223cf04304067f9579909fa1c267c71b
font_01_sfnt_off00009505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9505 3656 bytes
SHA-256: 63a179d8a9645bea05c6d53b1776faf4e4a7281930de6cf484e639846bec2e20
font_02_sfnt_off0000a1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1BA 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000aecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECC 18356 bytes
SHA-256: 7cdc4109e76722f5b523df4cd1b295e2212ddbe91aca110ba626f8c95e058f26

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