Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5099a2eec2a5eb…

MALICIOUS

PDF

41.9 KB Created: 2021-05-10 12:06:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9fda5ac4b6a65558234f8a0a4bc7ec26 SHA-1: 93907e910e80675146bbe636cda70ece12b08bdf SHA-256: 3a5099a2eec2a5eb8724cefc36b883494541b0f1f4dda16bb740aaca7da3f7f2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly flagged this PDF as malicious, and it contains an embedded URI pointing to a suspicious download URL. The document body, though malformed, suggests a lure for game-related downloads, likely to trick users into downloading malware. No scripts were extracted, but the presence of external URIs and the ML detection indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9774

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 https://netcdn.xyz/app/479516143/minecraft-for-free-apk-game-hack In PDF document text
    • http://portaluniversitasquality.ac.id:5388/perpus/repository/coin-master-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://www.portaluniversitasquality.ac.id:5388/perpus/repository/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://portaluniversitasquality.ac.id:5388/perpus/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://portaluniversitasquality.ac.id:5388/perpus/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://portaluniversitasquality.ac.id:5388/perpus/repository/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://portaluniversitasquality.ac.id:5388/perpus/repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://portaluniversitasquality.ac.id:5388/perpus/repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://portaluniversitasquality.ac.id:5388/perpus/repository/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://portaluniversitasquality.ac.id:5388/perpus/repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://portaluniversitasquality.ac.id:5388/perpus/repository/coin-master-coins_GM406889139.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_off00003fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3FDA 25080 bytes
SHA-256: 9b2c0c8b8988bbd32c6adff99a2483e19e55ff2837f6d3bb652c12433f65822a
font_01_sfnt_off000077fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77FB 3056 bytes
SHA-256: dd24a0ab94df4552e459bd06fd01b0fd3f021c1d51d1d64407070e735974a028
font_02_sfnt_off0000826d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x826D 18056 bytes
SHA-256: d47e60dea5201fd8468efb81a59f0775697a9902aff7ce548d06165675d44cc7

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