Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6cd94a25e226be0…

MALICIOUS

PDF

45.5 KB Created: 2021-06-09 08:59:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 87b35aac60d259a30a957379f6b1bb31 SHA-1: 7d0939d57d7dfd356f0a68af3962bd53cb46b548 SHA-256: b6cd94a25e226be0cf8dbf3e823288bf1d2074ee1e35fb199e0182ffd2190d4f
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.tw/app/431946152/free-girl-clothes-roblox-game-hack PDF link annotation
    • http://library.ulb.ac.id/repository/hack-ed-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-a-free-2021-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/earn-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-hack-tool-pc_GM406889139.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_off0000531d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x531D 25824 bytes
SHA-256: 35f9267f69fa192ef60d67ea76d5c42b9a57d842b224c0b2a58fc66a2e55349a
font_01_sfnt_off00008f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6C 18340 bytes
SHA-256: bcfd978e110b5bb702b0e05f08b56f78628afad83f1d59eac011323eab8dda66

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