Malicious PDF — malware analysis report

Static analysis result for SHA-256 e598757f7c3217a0…

MALICIOUS

PDF

43.7 KB Created: 2021-06-04 00:33:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5c658b4186cbf3e61e5ec8c256a9ca9c SHA-1: b9522a1f5256350d7bddc0108dc85cf431c30981 SHA-256: e598757f7c3217a06c09240e048437974b8a7aa487a72a8c3a30b824fe60e464
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on a malicious URL, disguised as a 'free generator / game hack'. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms a malicious workflow. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a potentially malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/rblx-gg-free-robux-game-hack In PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/roblox-tix-generator_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-mod-apk-hack_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/robuxmatchcon_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/how-to-get-minecraft-for-free-on-ps4_GM479516143.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_004_off00005095.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5095 24432 bytes
SHA-256: 1d64744fb7222182ae5356c3a76a47c8d423d5a2c22bcab6efc1c9d870ef9b9c
font_01_sfnt_off000087ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87EC 18376 bytes
SHA-256: 79d8ff6bb54f2bd25fce5899da6b269aa8d0d1da5a030d2c5dfc49c812010b5b

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