Malicious PDF — malware analysis report

Static analysis result for SHA-256 598574f0d67e5b05…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 16:21:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2e051c16f22346b93bde54ad7b2206a4 SHA-1: f0b074d1ccc54f82365c29961aeeb3734768a595 SHA-256: 598574f0d67e5b052934708f331e5523c99639b14536c252ca1059377cd30d46
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of 'free Robux' or game hacks to trick users into clicking a malicious link. The primary link, http://netcdn.tw/app/431946152/but-link-says-free-robux-game-hack, redirects to a potentially harmful site. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or redirection attack, likely intended to lead the user to a credential harvesting page or a download of further malware. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/but-link-says-free-robux-game-hack PDF link annotation
    • http://library.feb.unila.ac.id/rfeb//repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-pilliow-simiulator-free-pillows_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-elements-cheat-engine_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-get-a-free-scarf-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/hacks-counter-blox-roblox-offensive_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-why-dont-we-roblox-id_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/apps-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/pubg-uc-hack-2021_GM1330123889.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-hackeado-con-robux_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/blood-t-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/roblox-cp_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
font_00_sfnt_off00003112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3112 22396 bytes
SHA-256: 4aadfa52aef20a9df88192d7de870e07b61aef56cef0bf4196fdd10479f6d74d
font_01_sfnt_off000062ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62AB 19292 bytes
SHA-256: 85e89077dd7519a4f4a641b8f2e0513bf80b3f407ef760b68c8b6f40ad995aa9

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