Malicious PDF — malware analysis report

Static analysis result for SHA-256 5058550843fe9ac5…

MALICIOUS

PDF

35.7 KB Created: 2021-07-04 18:59:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: c810f8ece843b7d1d83863a2bdc0d706 SHA-1: 0c860ac5dab6e24a59e8bb5136305f12dd6e6c8c SHA-256: 5058550843fe9ac550ec07be44c07fd0ed7d57fdac5de895e1b218d3a8964dbb
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/roblox-download-game-hack PDF link annotation
    • http://elibrary.perludem.org/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/pokemon-go-free-items_GM1094591345.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/add-robux-free_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-make-a-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/btools-hack-pastebin-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/today-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/comment-hacker-un-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/freerubux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-gift-card-free-no-human-very_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-make-clothes-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-codes-and-obc_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/fishing-simulator-hack-roblox_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
stream_002_off0000342f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x342F 22512 bytes
SHA-256: 58617ed667d84f816a449eaa733daec8bb6a0df28ebb775188be1c862c919c3f
font_01_sfnt_off0000668c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x668C 18992 bytes
SHA-256: 42498b2248152e2d1ea08a4c56450afe296108018df271c09413f6b867f34853

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