Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8a0f4a3dc17813…

MALICIOUS

PDF

49.2 KB Created: 2021-06-03 05:51:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a156d19c1c2ca0ff2317ffb9adfc5dbf SHA-1: 16caca3368b8502e5b20262fd5ce8a0a523ca0cd SHA-256: bb8a0f4a3dc1781310ec73d808e08eaff9b552d5355320a0ca0d9115757d4bd3
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 0.9796

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/free-robux-generator-no-human-verification-2021-game-hack PDF link annotation
    • http://www.digilib.uim.ac.id/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-free-download-laptop_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/robux-game_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-village-cost_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-a2z-help_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-coin-master-glitches_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000502e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x502E 26356 bytes
SHA-256: 8e1b21b65377c361898e4cb0a8a86f8f47b0c20862c9e61a9500c574504a4f33
font_01_sfnt_off00008dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DAC 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ABE 19260 bytes
SHA-256: cfeb00e99c7da41c79bd6814c2de1bf58f441159bdfe452787b9448ffd27beb4

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