Malicious PDF — malware analysis report

Static analysis result for SHA-256 856d3d3d6bfe8796…

MALICIOUS

PDF

42.8 KB Created: 2021-05-12 01:00:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 80bc3a9c0c3c6b41a376f8ccfe6b834d SHA-1: 073193cdb2270246db1ef11307a8af8729532d32 SHA-256: 856d3d3d6bfe87969ef65efe1f873f8a7b12226f46100d9abf7e4c118e3b115e
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 0.9971

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.xyz/app/406889139/how-to-get-free-spins-on-coin-master-game-hack PDF link annotation
    • https://lib.unitri.ac.id//repository/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-roblox-followers-generator-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/game-hunters-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hack-ios-10_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-hack-spin_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-link_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/where-to-get-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/minecraft-free-download-apk-softonic_GM479516143.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_003_off00004b7d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B7D 25332 bytes
SHA-256: 51b60b565973c4e579342cee1ea860f46e7af879b9e6be5345de0805166b6b65
font_01_sfnt_off000085ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85EA 18052 bytes
SHA-256: ea84a6236c2a6e621998df031dd6ced14717eafc49be4f8ccfac8b30b37a9d36

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