Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e81c2387acdbd8…

MALICIOUS

PDF

34.2 KB Created: 2021-06-28 07:27:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4a8c6fba5643d524715b5714687effe4 SHA-1: d8812a248220016bb483bc06d8b2d0374653a7e1 SHA-256: 28e81c2387acdbd89fa5138cd3c65a597c30bc7ee419224444b99221f7b577a1
160 Risk Score

Malware Insights

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

The PDF contains links that are flagged as malicious redirectors, specifically pointing to a lure for Roblox game hacks. The document body and heuristics indicate a clear intent to trick the user into visiting a URL that likely serves a second-stage payload or leads to further malicious activity. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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/roblox-free-gamepasses-script-game-hack In PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-piano-hacks_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-work-at-a-pizza-place-money-hack_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/online-hacking-tricks-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-hack-blogspot_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-any-game-hack-script_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-tiktok-bots_GM835599320.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-dex-explorer-hack_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/tests-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/cheat-roblox-jailbreak-android_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-customize-roblox-skin_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-gift-cars-for-roblox_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/exosite-roblox-hack_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_off00002f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F2E 22208 bytes
SHA-256: e861231927af3c57ce3998f46e9c916ee01063e23cfd6914e20cdabac5975789
font_01_sfnt_off00005fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE7 19312 bytes
SHA-256: 4d3517a659e8fe1a00f807446c7efe5817ac245c8ca9b9fa7bc437d308ceeb83

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