Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb16bcfb803b1df3…

MALICIOUS

PDF

43.9 KB Created: 2021-06-03 04:10:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 78dcce6ccf3a1ba847000921d775419d SHA-1: 8eefae5e688fd20e58014826acf479e219256615 SHA-256: eb16bcfb803b1df380017690d83b67086b7a0a0e9a87507631f82388fcdaf4ff
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a malicious redirector link disguised as a game hack generator, designed to lure users into downloading a payload. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially malicious infrastructure supports this assessment. No scripts were extracted from this sample.

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/406889139/daily-coin-master-free-link-game-hack In PDF document text
    • http://library.umla.ac.id/repository/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/tiktok-free-view-jelly-fruit_GM835599320.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-25-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-fan_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-mod-apk-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/robux-generator-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/hack-coin-master-dzooka_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-real_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-skin-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-can-you-get-free-spins-on-coin-master_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_004_off00004dd5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DD5 25684 bytes
SHA-256: d904bddbde22de36df56ac13c02e29c9266b2e7de2b9deadcb076031d017bcf2
font_01_sfnt_off000088bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88BF 18304 bytes
SHA-256: b7b85e45b2e0fba94320617ceb2ece5ed3936c26fbb4efc42dbfdfbb85e9cc4e

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