Malicious PDF — malware analysis report

Static analysis result for SHA-256 4257426e676fb6cf…

MALICIOUS

PDF

50.3 KB Created: 2021-06-03 23:01:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 474bb545d6e58d0edbe9df72b52b56a3 SHA-1: 7c5708390affedfafb9cb0c8d52547965b16a9c9 SHA-256: 4257426e676fb6cf6ac25573ae2534dca9c8114be508d25c32a9f67fbd9fb51d
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains links to known malicious redirectors and lures users with a 'game hack' theme, aiming to trick them into downloading potentially harmful files. The heuristic firings indicate a lure for clipboard command execution, suggesting the user is prompted to copy and paste commands into a shell, likely to download and execute a second-stage payload. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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-free-download-android-apk-game-hack In PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-free-play_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-hack-ios-10_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/wurst-client-18-9_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-free-stars_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • https://code.giftcards.comIn 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_off000053a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53A4 30512 bytes
SHA-256: 4226c7cd71613dbb60e8c77fe83e80a3bf86b244fc51e95eec82d75672a55d63
font_01_sfnt_off00009744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9744 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off0000a0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0F7 18636 bytes
SHA-256: 653028bcb0f2fb6608854d40a7a9db9360db480d39b3fa53a0b8dd523b133d01

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