Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca15124d33f43b3c…

MALICIOUS

PDF

43.1 KB Created: 2021-06-03 08:50:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 95db879c12b649c716ccdc31547986eb SHA-1: e440ff4011117a895c3affcdf90802493ef13aa1 SHA-256: ca15124d33f43b3cd13e76e6197fcff54e699af03164f6e7cdaaca5e498a6570
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and game hack generators, presented under the guise of a fake CAPTCHA or human verification prompt. This suggests a lure to trick users into downloading or executing further malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/www-coin-master-hack-game-hack In PDF document text
    • http://digilib.stimata.ac.id/repository/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/robux-gg-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-code-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/minecraft-free-apk-download-016-0_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-minecraft-hacks_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_off00004dcb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DCB 24564 bytes
SHA-256: e4c9b7948a6354e7c14b507b7cd647446160c12c8425afdc4d7d5d0dc4e66901
font_01_sfnt_off00008642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8642 18080 bytes
SHA-256: 4b9d69ed48acd2f66a9eba21006e28ef4b60169f48a1b9b4029401c57655c2ee

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