Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9134803d94d472…

MALICIOUS

PDF

43.0 KB Created: 2021-06-03 22:11:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8e0a8f1bc4c04c8d0f55c95e51dd9596 SHA-1: 96d343045904a7c006a7bc6e3e33d1d55c8abbee SHA-256: fc9134803d94d472c741aef67ad3d4c22d5f8e390687ba342f14256a44160d06
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one that redirects to known malicious infrastructure associated with game hacks and generators. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the lure of "free generators" suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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/406889139/coin-master-online-game-hack In PDF document text
    • http://library.umla.ac.id/repository/coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-free-version_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-coin_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/do-robux-generators-work_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/oprewards-com-login_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-minecraft-pe-for-free_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_off00004df8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DF8 25364 bytes
SHA-256: 593c712c8ce3c9a27a8c143597eb484157b96220c98538c040ec30e5d17e6c15
font_01_sfnt_off00008775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8775 17620 bytes
SHA-256: 869d7695d274e208c7f4dfde8f160970e62420a8a3a2b9cf02de0f643df516c0

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