Malicious PDF — malware analysis report

Static analysis result for SHA-256 14bc83aea4ea8e0e…

MALICIOUS

PDF

42.2 KB Created: 2021-05-16 15:42:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4c9d6f14253d76ef9916e30c3a969239 SHA-1: 09dab81d5b9d75e861b45e4d38c134a5b2dc25a9 SHA-256: 14bc83aea4ea8e0e0078e14b5e42a2e0b6dfa5ffa668e5872cdd50993c5978b1
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA and a 'game hack' lure to deceive users into clicking malicious links. The primary link, https://netcdn.xyz/app/406889139/coin-master-free-spins-coins-game-hack, is associated with known malicious redirector infrastructure. The document's content and embedded URLs suggest a social engineering attempt to lead the user to a site that likely hosts or facilitates the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-free-spins-coins-game-hack In PDF document text
    • http://gornjastubica.hr/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coin-master-root-hack_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-free-100-spin_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/https-oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-robux-group_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/apk-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-to-make-a-minecraft-client_GM479516143.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-robux-reddit_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_003_off00004abe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ABE 24644 bytes
SHA-256: 5e295630be4a3de0223e7908ee17501f3784ae63f46eddb96a2b7c9f69592483
font_01_sfnt_off000083d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83D0 17884 bytes
SHA-256: 7b855ef2bb944b5b370c61480927ccad63ff31bdbf820bc1f0da9d35a10f5fb2

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