Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8567c3676cb85e6…

MALICIOUS

PDF

48.3 KB Created: 2021-06-11 10:30:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: aba0c3502869cd3c5c49a695bee4402e SHA-1: aa19e9c3aeab692d6d2103d0ed421c523a3b8fc7 SHA-256: b8567c3676cb85e646200d7daa71a9c0202beba390174540ff802454c80590ef
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 0.9796

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 https://netcdn.tw/app/431946152/free-roblox-toy-june-2021-game-hack PDF link annotation
    • http://opac.stieimalang.ac.id/repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/its-free-roblox-id_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-free-gold-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/near-tiktok-free-fire_GM835599320.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-roblox-ad-maker_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/claim-robux_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/roblox-free-robux-live_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000509b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x509B 26212 bytes
SHA-256: b64c08548c7b4e82ffbee2ee71bbe0bd63174ab4613f937e5599b806ae50f134
font_01_sfnt_off00008bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC5 3656 bytes
SHA-256: 63a179d8a9645bea05c6d53b1776faf4e4a7281930de6cf484e639846bec2e20
font_02_sfnt_off0000987f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x987F 18836 bytes
SHA-256: 6032bc8302e36c4a4de8ea9b61bed9affaa97271077ba84763652dea44044e27

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