Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c9b5c757f167a9…

MALICIOUS

PDF

47.3 KB Created: 2021-06-03 07:12:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3cea4b8fd9a59f2162574c9771faf6a3 SHA-1: 5ccd71df3e21f1ca01d433e296aac0d1fae84daa SHA-256: 77c9b5c757f167a9c57c062f77d4f4c42009765cabb380b7a297f2230afabf71
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'generators'. The primary link directs to a URL associated with known malicious redirectors. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering lure designed to lead the user to a potentially harmful site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/431946152/my-roblox-avatar-game-hack In PDF document text
    • http://lib.icbc-indonesia.org/repository/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/how-do-you-get-roebucks_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/can-pokemon-go-free-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/claim-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-cheat-engine-hack_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • https://collectrobux.coIn 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_004_off000050c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C3 25844 bytes
SHA-256: e64d73a227b65db8ffd0a943145f070f8ee674d539a49db07bccf6531490f48f
font_01_sfnt_off00008b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B52 2844 bytes
SHA-256: 0b020d44d68ef4680adc1a010952b014984ad7d4b9ed9f851efb57a64041e860
font_02_sfnt_off000094f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94F9 18604 bytes
SHA-256: cc2ffa7c3a9026ed881cd01f42f990a164ca5dac15d0d25057d5d6d73c318e0d

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