Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb27d9d598d8bea…

MALICIOUS

PDF

51.5 KB Created: 2021-06-09 11:49:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8a7ac5c274fbc7fb029f9adf1ec6532b SHA-1: aa02713292f9be216284635ba1b8bb4eaca8e49d SHA-256: bcb27d9d598d8bea742cf87b98f9812f1d14d2092fba1a82ef534b4e0751ef24
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically a site offering free game hacks. The ML classifier also flagged this PDF as malicious. The presence of a download button lure reinforces the social engineering aspect of the attack. No scripts were extracted, but the primary attack vector appears to be a phishing lure leading to a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9327

Heuristics 3

  • 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 https://netcdn.tw/app/431946152/roblox-that In PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/is-there-an-app-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-roblox-accounts-with-robux-bugmenot_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-robux-hack-on-robux-store_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-get-free-robux-no-ban_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/roblox-free-gift-cards-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/roblox-jailbreak-hack-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-get-a-free-name-change-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5263 30576 bytes
SHA-256: 90179131931e016a6d029230b002dd35f0be71d089d3625e4e0dd6104f1cdde6
font_01_sfnt_off000098e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98E3 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000a5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5F5 18508 bytes
SHA-256: 6f5de5480c75e470051ddc22f95e57b1e202c6bc9ac12248dd34d9521089e714

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