Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59a66ca662af346…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 02:56:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 14241506a4ce075330770f1d076cc938 SHA-1: d9d7553449542f13e8c0a7abda75f7ebb07d5cb6 SHA-256: c59a66ca662af3465e8f7b82f73cc383b43bde8ff53c859b1b5d70d849226a33
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirector domains and pages promising game hacks and free currency, a common lure for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and a visual download button further supports a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-hack-free-spins-game-hack In PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-card-hack_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/my-roblox-account-was-hacked_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/roblox-free-robux-scam-discord_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/download-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/gcomment-hacker-strucid-roblox_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/roblox-free-clothes-boy_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/roblox-hack-dungueon-questcom_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-51-robux_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/how-to-buy-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-roblox-accounts-with-bloxburg_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000033e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33E2 22972 bytes
SHA-256: c2b87e4434d4bbf02571279ce1dd468abfaef09ba0eaecfe2e645c7b287ec909
font_01_sfnt_off0000677a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x677A 18344 bytes
SHA-256: 947667c85d24b0d3a8de245f111eeade861a88a333665e7462fd4878b305e25b

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