Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ca8eabfb4690f6…

MALICIOUS

PDF

41.7 KB Created: 2021-05-12 07:33:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3bea6bc3fa3d1555681b0b96573e713a SHA-1: b7b612458067681a6a113bf406c77c265de301f7 SHA-256: a9ca8eabfb4690f62bd84362f3cb86a835dc49a1eab87df119283f1b146635b4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising "Coin Master Free Spins" and "Robux hacks" to lure victims. The primary malicious URL identified is https://netcdn.xyz/app/406889139/coin-master-free-spins-facebook-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt, likely leading to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/coin-master-free-spins-facebook-game-hack In PDF document text
    • http://library.unissula.ac.id/fk//repository/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-free-codes_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/moonactive-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-cracked-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-hack-online-generator_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-robux-download_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-free-spins-and-coins-haktuts_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/roblox-verification_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-mod-version-free-download-v344_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
stream_003_off00004803.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4803 25052 bytes
SHA-256: cfafa3a44cb962c9ca3339be97eabb49560255796f00d821470865762318648d
font_01_sfnt_off000080e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80E5 18212 bytes
SHA-256: a7d0484bdc545634c9b46f4dcbf794c30064c3aaaf3cdd537b213ac19f08a95c

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