Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b488f62bf9604a…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 22:51:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ff9b585c41f2212c19332f94cf8ff5cf SHA-1: 8e6a82d08a3b7e85d8fd8f346c68cb1a942e068c SHA-256: 90b488f62bf9604afc87812e7c9e77b204c65c8a67f0dd356070befd619bfb19
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.online/app/406889139/earn-free-spins-for-coin-master-game-hack PDF link annotation
    • http://perpus.wdh.ac.id/repository/tiktok-free-view-iphone-wallpaper_GM835599320.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/collect-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/pokemon-go-free-and-home_GM1094591345.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/robux-giver_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/minecraft-windows-10-hack-client-2021_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/oprewards-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-many-villages-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/robux-free-com_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_off00005133.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5133 24820 bytes
SHA-256: 4620eeceb0ff9c5f8f7cf2e83b9b42f32dc71a4bed812f0b34cb77e27b3dc948
font_01_sfnt_off00008969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8969 17884 bytes
SHA-256: 5bc2196f595048cd80966dd69d9ac8940a13da3f79f6604a1c949c9b3772e03c

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