Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38c77c1a738102c…

MALICIOUS

PDF

33.5 KB Created: 2021-06-29 19:28:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 42d51cabd38e1698b848742e6820540b SHA-1: ed4a18f3947ff274f1709e6ccd537138714d14f2 SHA-256: e38c77c1a738102cd36e1fd89feb69c030a2cc1d0f70b4da5e96d84fe4967623
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as offers for free Robux or game hacks. The document body and embedded URLs strongly suggest a phishing or scam attempt, likely to lead users to further malicious content or credential harvesting sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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-robux-if-you-join-my-group-game-hack In PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/robloxcom-free-kkk-k-k-k-k-m-k-l_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/cheat-for-tickets-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/how-to-be-an-oreo-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/easy-hack-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/free-robux-youtube-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/link-for-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/free-robux-in-roblox-pc_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/roblox-free-generator-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/free-game-unlock-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/how-to-speed-hack-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/enter-thsi-pin-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/roblox-free-clothes-codes_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_off00002a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A3C 22496 bytes
SHA-256: fbf9aa9a17a4cb898cf56bbd2a132f689fe22abac742183046d2ecfe2a396969
font_01_sfnt_off00005c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C47 19716 bytes
SHA-256: 227657cd6b0def944528b604c68a9ba263540e03f570bfea84e4441f56a2f664

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