Malicious PDF — malware analysis report

Static analysis result for SHA-256 171b562f703cf875…

MALICIOUS

PDF

33.8 KB Created: 2021-06-20 09:53:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2fcebd3d27bbf5ba2f77026155ad8367 SHA-1: a5cde73a6991826243529ffa3f068b7f1202c515 SHA-256: 171b562f703cf8758de95cdcf10185517b0d4a84882be02a4679c2fe257d5030
160 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically a URL associated with free Robux generators and game hacks. The document body and heuristics indicate a lure to trick users into clicking these links, likely leading to further malware downloads or phishing attempts. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.co/app/431946152/free-working-robux-codes-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/get-500-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-generator-no-survey-d_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hack-do-roblox-cs-go_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/tiktok-free-palestine_GM835599320.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/elysian-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-games-80_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/black-magic-roblox-hack-script_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-sued_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hack-roblox-murder-mystery-2-youtube_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/can-you-download-roblox-on-ps4-for-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-accessories-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-microsoft-rewards_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_off00002d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D63 21992 bytes
SHA-256: bc7dd35e3262db7e9e060cfbe8e9df6aa8fb03634cfe3f1b5643e5026c583b38
font_01_sfnt_off00005e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E25 19380 bytes
SHA-256: 11f845e8e2c6e944c6b1aabe2018263654bf18326ecc60811450bba544f57f3d

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