Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fa181d5c34cd0b…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 10:53:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 44a3d7cc4d9174e61afb1219cc07ca62 SHA-1: ab3955f3c30442a9b7c3dc84da10d937889aefce SHA-256: 42fa181d5c34cd0bbf8924ffd24234f4c5fb96ddd23abbd052991090635b02c9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'robux hack generator' and similar game-related lures. The presence of a download button heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into visiting potentially harmful sites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or scam attempt.

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/robux-hack-generator-game-hack In PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/dominus-roblox-free-hat_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/static-moonactive-net-rewards-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/dll-hacks-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-hack-no-human-verification-no-survey-no-download_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/roblox-download-pc-free_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-spin-card-exchange-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-free-roebucks-without-verification_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_off00002fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FCE 22532 bytes
SHA-256: 98472adbaf992fe080a4876cda25754dab81bcdf3acd05b397ebdc5e98580e07
font_01_sfnt_off000061e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E2 18824 bytes
SHA-256: 6a2f4fb47bcac7a1427eb84fb186ae35d3638566a93e34d85c8a35338f058712

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