Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db90c408c25a249…

MALICIOUS

PDF

44.9 KB Created: 2021-05-11 07:01:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 976c63abff60a2652e6248fffd8e1102 SHA-1: a68d5c842eca0aacfa0b10de9cfe288f2b7c998b SHA-256: 0db90c408c25a249baa143afc7b5175dec760e3ac9991c1696b129db51fcd174
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that lead to a known malicious redirector and various download sites, likely to deliver malware or facilitate scams. The document body explicitly mentions "Free Robux Generator" and "without human verification", indicating a common lure for credential harvesting or malware distribution. No scripts were extracted, but the presence of malicious links and the lure strongly suggest a phishing or malware delivery attempt.

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 https://netcdn.xyz/app/431946152/free-robux-generator-without-human-verification-game-hack In PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/robux-free-online_GM431946152.pdfIn PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/grabpoints-robux_GM431946152.pdfIn PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/robux-free-com_GM431946152.pdfIn PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/free-coin-master-cards-link_GM406889139.pdfIn PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/coin-master-free-spins-link-june-2021_GM406889139.pdfIn PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/coin-master-blogspot-free-spins_GM406889139.pdfIn PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/i-got-hacked-on-roblox_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_off00004b54.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B54 27988 bytes
SHA-256: 802c40facd393de62edeb4a821c1492112894f1d2b87fe43758f73f9298b53a2
font_01_sfnt_off00008abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ABC 19224 bytes
SHA-256: 40a7d61fbe05f3c06cc4b4f213318e5db23b17d00e7c534d307fd6e415ac6071

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