Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c949562c6e3135a…

MALICIOUS

PDF

43.2 KB Created: 2021-05-16 06:23:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f5633059393ded88661c5337e707dc62 SHA-1: 79fe7c56d99191281a951e5c7c0f152bc1426820 SHA-256: 8c949562c6e3135a2801597d4cfc776075a72a3e256bc83103489d93ee788c7d
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to external websites, including a known malicious redirector, masquerading as game hacks and free currency generators. The presence of a fake CAPTCHA heuristic suggests an attempt to trick the user into interacting with the document, likely to trigger a download or exploit. No scripts were extracted, but the document's structure and embedded URLs indicate a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/apps-to-get-free-robux-game-hack In PDF document text
    • https://www.san-ben.com.tw/upload/files/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • https://www.san-ben.com.tw/upload/files/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • https://www.san-ben.com.tw/upload/files/coins-master-hacks_GM406889139.pdfIn PDF document text
    • https://www.san-ben.com.tw/upload/files/reddit-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.san-ben.com.tw/upload/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • https://www.san-ben.com.tw/upload/files/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • https://www.san-ben.com.tw/upload/files/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • https://www.san-ben.com.tw/upload/files/how-to-get-free-coins-and-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.san-ben.com.tw/upload/files/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.san-ben.com.tw/upload/files/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • https://www.san-ben.com.tw/upload/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://www.san-ben.com.tw/upload/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.san-ben.com.tw/upload/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.san-ben.com.tw/upload/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.san-ben.com.tw/upload/files/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.san-ben.com.tw/upload/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://www.san-ben.com.tw/upload/files/free-robux-offers_GM431946152.pdfIn PDF document text
    • https://www.san-ben.com.tw/upload/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.san-ben.com.tw/upload/files/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.san-ben.com.tw/upload/files/como-hackear-juego-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_003_off000048d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48D1 27372 bytes
SHA-256: 580697db8f55f0f4607c9e7f3934c57686d004b24671d2cfdc9ce3616011a03f
font_01_sfnt_off0000866c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x866C 18292 bytes
SHA-256: b4e5860ebf2343f9b18b94d86a305cbc7e8ebd2f2a6bfe7ceeed88b67548d8bf

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