Malicious PDF — malware analysis report

Static analysis result for SHA-256 e288511f9f5f79dc…

MALICIOUS

PDF

45.7 KB Created: 2021-06-11 13:15:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9de5d0271bf8da3532429b0828154126 SHA-1: c9269e2fba506dfe28903f76b5b9375dcc74934d SHA-256: e288511f9f5f79dcffbb920116c9115fc04467a170ef19107060affffd457cd0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector infrastructure that is associated with malicious activity, specifically luring users with promises of free game currency or hacks. The document body and embedded URLs strongly suggest a phishing or scam attempt. While no scripts were explicitly extracted, the nature of the links and the heuristic firings indicate a high likelihood of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/how-to-get-free-robux-2021-september-game-hack In PDF document text
    • http://bepquannhu.vn/upload/editor/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/roblox-free-5-robux_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/i-am-hacking-roblox-jump_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-tiktok-accounts-with-followers_GM835599320.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/roblox-coregui-hack-making_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/hack-roblox-names-and-passwords_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/games-that-give-free-robux_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_off00005228.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5228 25568 bytes
SHA-256: 133e93a855a37601a33b88f2ec7675ff10f9737dd96fd3d96e77dab53b995c7a
font_01_sfnt_off00008d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D81 19120 bytes
SHA-256: 6d527df4516fd7db389eba9cd4a6f4dadf7e12b9b09124d2591096f0b71df221

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