Malicious PDF — malware analysis report

Static analysis result for SHA-256 3792e0b43f805d6e…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 00:32:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7f9e855bbac9fcd605adc5e250820513 SHA-1: 978d00ced9ea49f30d9b57d95b1b4dd9b92f51cc SHA-256: 3792e0b43f805d6e59a419bc9d20fc2bcf68332fe60046932945a568777c20ed
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically designed to lure users with promises of free game hacks and Robux. The document body and heuristic firings confirm the intent to redirect users to potentially harmful content. No scripts were extracted, but the embedded URLs and the nature of the lure strongly indicate a phishing or scam 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 http://netcdn.tw/app/431946152/oprewards-free-robux-game-hack In PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/add-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/draw-free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/hack-coin-master-app_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/online-coin-master-free-spin-app_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/113-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/microsoft-bing-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-coins-and-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/op-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/can-you-get-free-tiktok-fans_GM835599320.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
font_00_sfnt_off000030a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A8 22212 bytes
SHA-256: de66353481a7ced775d3ae408f31dfef492c79782696d99e9277461bd0d22d74
font_01_sfnt_off000061e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E7 19228 bytes
SHA-256: 28d2551d9716c0c1f642d1de59876c155fe982ad5f1d32fc26186d5dbb125a3e

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