Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a37f831c60d931a…

MALICIOUS

PDF

43.6 KB Created: 2021-06-08 16:05:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1bc05e9577e8f9f781ab58375d15f0aa SHA-1: b824f45887bea9d1a12213812b80653dcb4ab8fe SHA-256: 8a37f831c60d931af57afc29494b4b65bf0e7fe8cca35f4f03abe1746a33242c
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 0.9865

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/roblox-phone-hack-game-hack PDF link annotation
    • http://elibrary.perludem.org/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hack-tool-no-human-verification_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spins-save_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/i-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spins-and-coins-for-today_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hack-apk-iphone_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/todays-free-spin-and-coin-links_GM406889139.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_004_off00004ea0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EA0 24944 bytes
SHA-256: a43e263e3a5b72e5e1a7a3e5f0eeb76caf8cbbe5390b40c11c3f93f3d2050778
font_01_sfnt_off00008727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8727 18504 bytes
SHA-256: b0b55d47ba40fdefe17dc44286e33d9f8009759ae510757832cac07439af1969

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