Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d90139b5434ee9…

MALICIOUS

PDF

44.7 KB Created: 2021-06-11 07:44:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c13cc3abd777e7cd890a5a14498995f7 SHA-1: 57da2d3aca12da7140cc9980ab8a51ee23751fe7 SHA-256: 76d90139b5434ee994d09649f905e2d1a6aabd6330c753af7380d7f3c64079af
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/how-to-get-robux-for-free-on-a-huawei-game-hack PDF link annotation
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-shoes-free_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/unpatchable-robux-hack-robuxian-code_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/app-to-earn-free-robux-for-downloadign-games_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-root-hack_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/village-coin_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-com-easy_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-system_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/robux-free-promo-codes_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_004_off0000511f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x511F 25940 bytes
SHA-256: 80b0fbdabcb4557d3a350e87870e392fd5fe9b6b61f949491764c9ba2051a269
font_01_sfnt_off00008b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B13 18628 bytes
SHA-256: 37aaf970329125829fa04d2dbaba709b2f3dda5368d903ba3a71eca954a4f107

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