Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b10656704372973…

MALICIOUS

PDF

45.0 KB Created: 2021-06-03 18:59:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c95721cb59575f8019b9b3d4912c9718 SHA-1: fcdec390911b5927052f5d2cfc5e84f7bf4de0ed SHA-256: 3b1065670437297373f9739a890c49fbcd9c148f5442c7fd3978e1bab7a327b3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising free game hacks and generators. The primary lure URL is 'https://netcdn.online/app/479516143/minecraft-story-mode-free-download-game-hack'. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious redirection, likely leading to further malware downloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/479516143/minecraft-story-mode-free-download-game-hack In PDF document text
    • https://cuc.ac.cr/userfiles/files/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/get-robux-today_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/getrobux-come_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/tiktok-free-liker-apk-download_GM835599320.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/krnl-roblox_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-games-download-free_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/tiktok-free-views-apk-download_GM835599320.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/is-free-robux-real_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-get-robux-for-free-2021_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_off00005286.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5286 25540 bytes
SHA-256: d14d097dad537693dc225f927bdfcc5932d2d2b94ee2681e93389ba8504f9856
font_01_sfnt_off00008cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CEE 18468 bytes
SHA-256: b60985c1befe233451c1e4628b3545798255342bb86f0eafc92eb610c8c57488

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