Malicious PDF — malware analysis report

Static analysis result for SHA-256 4904788f4eda6b7d…

MALICIOUS

PDF

43.6 KB Created: 2021-06-08 15:21:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: be74de731e81b70ea042608d9d980726 SHA-1: d5fb6c34e63d9b639013a53a28a2ff8c7a6f3a3c SHA-256: 4904788f4eda6b7dfbd34033b06d2882242d7c93c7dde5735620dcd00e8490ac
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a fake CAPTCHA lure and links to a known malicious redirector, aiming to trick users into visiting a site offering game hacks. The embedded URLs, such as 'https://netcdn.tw/app/431946152/free-hair-roblox-boy-game-hack', are designed to lead users to potentially harmful content. The document's structure and heuristics strongly suggest a social engineering attack to drive traffic to malicious websites.

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.tw/app/431946152/free-hair-roblox-boy-game-hack In PDF document text
    • https://nature-air.com.tw/upload/files/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-download-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/get-coin-master-cards-free_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-online-hack_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-www-com_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/getrobux-come_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-many-levels-are-there-in-coin-master_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/freerubux_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-free-spins-link-cheat_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-codes-generator-no-verification_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_off0000491a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x491A 27388 bytes
SHA-256: 9d7ebfbee12159a5ede3a3f3a6fcafd3373a2d118829f06ed6c2b6022c22bf23
font_01_sfnt_off0000874e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x874E 18476 bytes
SHA-256: 342c800fef319d477b03ab518beae0bffc424861c275c3bcc7706f7950f542c9

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