Malicious PDF — malware analysis report

Static analysis result for SHA-256 287a2b3af1bd6463…

MALICIOUS

PDF

35.3 KB Created: 2021-07-06 10:15:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 76d52ba987e4935dae84634a40447b07 SHA-1: 82a7b743a038464a6ffc71e32118b817eebf4c12 SHA-256: 287a2b3af1bd64638b59a9280a01feea3aab0d8a06237d87d1ef3466533fc7b6
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive lure. 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 0.9980

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://netcdn.tw/app/406889139/coin-master-free-spins-2021-ios-game-hack PDF link annotation
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-do-i-get-free-robux-in-rolblox-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/best-meme-tshirts-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/funny-roblox-hacker-names_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-stuff-in-roblox-august-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/3oblox-free-robux-hack-obc-99m-working-ios-pc-android_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/can-you-get-free-robux-on-cheat-enine_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/easiest-way-to-get-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-modded-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-free-robux-no-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/descargar-hack-para-phantom-forces-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/elemental-battlegrounds-roblox-shard-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-no-logo_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_002_off00003087.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3087 23964 bytes
SHA-256: a383e192f0bd07400422342297cf44b6ce9f4a2e6f9877b3be70bef59274bbe5
font_01_sfnt_off0000666e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x666E 18576 bytes
SHA-256: 0dfd9ad4574e16d128bb07cca9367f8481bce3726671877faa7810562d13a14b

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