Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f7f7e25f633773…

MALICIOUS

PDF

44.5 KB Created: 2021-06-04 00:52:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 762f2fcad1c0a5dcff1a8ee42154b240 SHA-1: 2c74afd46558da13440063cd29d9ad56cd647f12 SHA-256: a4f7f7e25f63377307b7bde75e228bd5e8748bfb59879232edc6c05aedaf802c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure for game hacks and free currency, directing users to a malicious URL. The ML classifier also flagged this PDF as malicious. The primary IOC is the redirect URL, which likely leads to a further stage of infection or phishing. No scripts were extracted from this sample.

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/coin-master-hack-version-2021-free-download-game-hack PDF link annotation
    • https://library.uigm.ac.id/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/cm-spin-link_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-800-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/robux-for-kids_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-download-pc-free_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-generator-no-verification_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_off0000519b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x519B 24356 bytes
SHA-256: 20f6ddb822084a6a6fb719c92d599af9f40e9b2eda94ea4fa77137a20f18c796
font_01_sfnt_off00008908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8908 18996 bytes
SHA-256: 92d9309ab276bc9aab9745226f7a970795db6d0c86763d97e38cf379742c13e0

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