Malicious PDF — malware analysis report

Static analysis result for SHA-256 98284ebc03d5af1b…

MALICIOUS

PDF

45.6 KB Created: 2021-06-10 23:52:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 38a00d3d1c87fc706eed040dc76bb863 SHA-1: c0eed08e5260756ad1d4d22d32415a56e4199613 SHA-256: 98284ebc03d5af1b63e347aa502e1678cb64a9d4c0626d46c14bd7d21afc8542
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'free generators' or 'game hacks'. The primary lure URL is https://netcdn.tw/app/431946152/free-roblox-army-templats-game-hack, which is flagged as a malicious redirector. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/free-roblox-army-templats-game-hack In PDF document text
    • http://perpus.masda.ac.id/repository/get-more-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/online-coin-master-free-spin-app_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/ac-market-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/claim-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-apk-hack-mod-download_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-hack-coin-master-game-without-verification_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/roblox-free-body_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://Buy.HoaxMC.comIn 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_off00005090.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5090 27432 bytes
SHA-256: f483afec0a31cb2d5580410349d74ee1af88d5cc5d3acf4ce9cbb79999d8f2a4
font_01_sfnt_off00008dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFB 18896 bytes
SHA-256: e0f8cf8556c4765c09c9b881a5e9233b0708dfebfd5d930bf5f51da0706f5014

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