Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be84f91d66165dc…

MALICIOUS

PDF

43.2 KB Created: 2021-06-04 00:33:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6e8c162713976c393cbef86190c2c8b0 SHA-1: 0a5e17eb584c8a617f4690b86866ee6a52e794ec SHA-256: 8be84f91d66165dcb017f9ba4736f42a0e6c05aab855f6930e44a95dc8d388bc
200 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and links to a malicious redirector that hosts game hack content. The primary URL, https://netcdn.online/app/406889139/lucky-patcher-coin-master-hack-game-hack, is associated with known malicious infrastructure. The document's structure and embedded links suggest an attempt to trick users into downloading or executing further malicious content, likely through a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/lucky-patcher-coin-master-hack-game-hack In PDF document text
    • http://library.yamasi.ac.id//repository/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hack-coin-master-game-apk_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-handbook_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-spin-now_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-client_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/pokemon-go-free-trades_GM1094591345.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/pokemon-go-free-download-for-windows-10_GM1094591345.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-redeem-codes-2021_GM431946152.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_off00004db1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DB1 24544 bytes
SHA-256: 0ca9645ae4b6bad000acfa46e9bff0abe86dae034de5b2c5c3ba24a41451a32a
font_01_sfnt_off00008609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8609 18356 bytes
SHA-256: 8ec65d0f5dc2d155408c54e8fca99d6e5dff9ed808b7c9158d2ba030e67357e0

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