Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e90f1b819042db4…

MALICIOUS

PDF

34.8 KB Created: 2021-06-18 03:23:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: fbdaae24c8adef316ae48d85148e71cd SHA-1: 7d1335379e222e0f0b9a1621f876d242692e1c48 SHA-256: 4e90f1b819042db4d51fc536a86cf1cebc2b7df3dafde4bc3918c02c408f6452
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body and embedded URLs reinforce this, indicating a phishing attempt to trick users into visiting a malicious site. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit vulnerabilities or deliver a payload.

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/hack-robar-c-uentas-de-roblox-akaka-game-hack In PDF document text
    • http://perpus.masda.ac.id//repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-bc-for-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/robux-sign_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/new-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hack-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/bad-minecraft-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/wurst-115-2_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/jailbreak-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-level-100-hack_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-foxy-food-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-mast-hacks_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_off0000321b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x321B 22172 bytes
SHA-256: 3a84065c34672c8795bdb420bfce5c71d1657522ffebfad4083c22e39d82de74
font_01_sfnt_off00006348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6348 18928 bytes
SHA-256: 082b2a2693345d07a5733b7c7c437f1a53f2c9c21f67e75c87ca7ba73960625e

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