Malicious PDF — malware analysis report

Static analysis result for SHA-256 377dd9e6c9db8f1b…

MALICIOUS

PDF

33.1 KB Created: 2021-07-04 10:26:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 81bf224c81bbdf42d97dfaf11a06ac45 SHA-1: a48e4e96853459993f26ca546dbceb796fbe9b33 SHA-256: 377dd9e6c9db8f1b0223fd27d3df7ed22ec8530eb87e64909a33644cf770c66e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-risk heuristic firing for linking to a 'free generator / game hack' redirector, which is a common lure for malicious content. The document body and embedded URLs reinforce this theme, pointing to a URL that promises free Robux. While no scripts were explicitly extracted, the nature of the lure suggests it aims to redirect users to a site that likely hosts a malicious payload or phishing content.

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/rbx-free-robux-game-hack PDF link annotation
    • https://perpus.upp.ac.id/digilib/repository/hack-my-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/appsmob-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-spins_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-hack-avatar-the-last-airbender-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/earn-robux-now_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-roblox-assassin-knives_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-spin-link-in-coin-master-game_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-obby-uncopylocked_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-robux-hack-computer_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/wurst-hacked-client-112-2_GM479516143.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_off00002e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E5A 21432 bytes
SHA-256: ea71c74c12cfae6acd00a474b278d44d6d8165cc8b1efd942c4a35a8a8c856b4
font_01_sfnt_off00005d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D36 18716 bytes
SHA-256: df5c5e0cfb8f7f2dfb35d0ecea75bc73877d40549e98d215878e07f2572b6ccc

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