Malicious PDF — malware analysis report

Static analysis result for SHA-256 542acaa85adffa73…

MALICIOUS

PDF

34.9 KB Created: 2021-06-29 16:14:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0bba915fdcaab404f814bd0abc7a8f1b SHA-1: d15fce24713000bb0b5101edf987050f2b8d70ca SHA-256: 542acaa85adffa7388609dd03222fa483c8d322367cbf7bf5d56a866cc3890a8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a prominent link to a known malicious redirector, disguised as a 'Robuxian 500m Robux Hack'. The document body and heuristics indicate a lure for users to click this link, likely to download a second-stage payload. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or malware distribution scheme.

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/robuxian-500m-robux-hack-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-roblox-legally_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-womens-face_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-hack-fairy-tail-forgotten-legend-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/no-download-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-2021-yt_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-adopt-me-hack-script_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-link-app_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-generator-hack-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-free-accounts-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/pixel-art-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spins-apple_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
font_00_sfnt_off00002fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FC5 22548 bytes
SHA-256: 93c0a64e5f233c44729a02754bb98b95cff52c9e8a408372c6ae0be7116dd83c
font_01_sfnt_off00006245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6245 19408 bytes
SHA-256: 1c98d899ed38ba98bc226085b9ac799a652ec3fffa70a2422a6149cd5d590fa9

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