Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac96648cd664c4b…

MALICIOUS

PDF

44.3 KB Created: 2021-05-14 00:21:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8bfc70ce9b1c0d427efeb6a980abc4f7 SHA-1: 459c49dcb2d86882186c7e243d65baaff1764420 SHA-256: 6ac96648cd664c4b53264e67028875023f600d986916df58e12e040cfcacaaba
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with the promise of a game hack. The document body, though heavily obfuscated, contains a URL that aligns with the malicious redirector findings. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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 https://netcdn.xyz/app/406889139/coin-master-apk-hack-mod-download-game-hack In PDF document text
    • http://empresa-venta.hr/files/_GM479516143.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-mod-apk-free-download-for-android_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://empresa-venta.hr/files/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-hack-spin-160-pro_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-spins-coin-master-android_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/wurst-minecraft_GM479516143.pdfIn PDF document text
    • http://empresa-venta.hr/files/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-roblox-adopt-me-pets_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/roblox-generator_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000046f6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46F6 25328 bytes
SHA-256: b419ceca6d0c0e789c036782c031df752ce087759af0dafe44f98f2eae37d0d4
font_01_sfnt_off0000800c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x800C 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off000089af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89AF 18472 bytes
SHA-256: 9ab3b4b182d28f91be74dc6255d436493892cab70750f0f5ae683b970a059213

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