Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3b07ad872b04f2…

MALICIOUS

PDF

44.7 KB Created: 2021-05-12 10:11:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: faceab6f7f3c4b0c3bac38cd842fac34 SHA-1: 411cfaad3af55ecf149546c16eeb2d7831f65389 SHA-256: ef3b07ad872b04f222b92d0b1666a3d18c23316067b8d88eab13940dd3a3d5d8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free generators' to lure users. The primary malicious URL identified is https://netcdn.xyz/app/406889139/coinmasterfreespins-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to download malicious content or visit phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/406889139/coinmasterfreespins-game-hack In PDF document text
    • https://elearning.mtsasyrofuddin.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsasyrofuddin.sch.id/__statics/gudangsoal/files/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsasyrofuddin.sch.id/__statics/gudangsoal/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsasyrofuddin.sch.id/__statics/gudangsoal/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://elearning.mtsasyrofuddin.sch.id/__statics/gudangsoal/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsasyrofuddin.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://elearning.mtsasyrofuddin.sch.id/__statics/gudangsoal/files/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsasyrofuddin.sch.id/__statics/gudangsoal/files/free-spins-promo-code-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsasyrofuddin.sch.id/__statics/gudangsoal/files/free-robux-scams_GM431946152.pdfIn PDF document text
    • https://elearning.mtsasyrofuddin.sch.id/__statics/gudangsoal/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsasyrofuddin.sch.id/__statics/gudangsoal/files/coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsasyrofuddin.sch.id/__statics/gudangsoal/files/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • https://elearning.mtsasyrofuddin.sch.id/__statics/gudangsoal/files/coin-master-village-4_GM406889139.pdfIn PDF document text
    • https://elearning.mtsasyrofuddin.sch.id/__statics/gudangsoal/files/moonactive-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsasyrofuddin.sch.id/__statics/gudangsoal/files/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsasyrofuddin.sch.id/__statics/gudangsoal/files/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • https://elearning.mtsasyrofuddin.sch.id/__statics/gudangsoal/files/corn-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsasyrofuddin.sch.id/__statics/gudangsoal/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://elearning.mtsasyrofuddin.sch.id/__statics/gudangsoal/files/coin-master-hack-tool-access-online-generator_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
stream_003_off00004b15.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B15 24784 bytes
SHA-256: 6c37017ca2cecb88cf5081aca7bc679dbab15d41d5ff7b35760bd13e07d974f0
font_01_sfnt_off000082a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82A0 17980 bytes
SHA-256: 48872130680f0d6309128a4b322cbb0730700ec4544966fd5aa3d357de7636d5
font_02_sfnt_off0000a3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3A5 3264 bytes
SHA-256: e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088