Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81bef0f151b2a7f…

MALICIOUS

PDF

45.3 KB Created: 2021-06-03 22:06:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 183c142ef4d3fcc61c879f02f2c16120 SHA-1: f9b6250729cd18fc6b1d32c0865812a431e3fa51 SHA-256: b81bef0f151b2a7f320a623fad7ccf866f4a404697ede6ab50538367794cd4c9
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 0.9864

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/431946152/who-to-get-free-robux-game-hack PDF link annotation
    • http://e-library.akademitelkom.ac.id/repository/mcpe-client_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-roebucks_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/instagram-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-minecraft-realm-codes_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/oprewards-points-generator_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_off0000540c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x540C 25104 bytes
SHA-256: 11322f4ac9ae0fabcfb9b974336ce6bd5568e1499bcf7fa4d7f651f7d42036d9
font_01_sfnt_off00008e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E08 18484 bytes
SHA-256: 7ba6f7de64c6d8ae6f5469fb20d9bd46bb355649f5c0a9ce8a2cee34149577d7

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