Malicious PDF — malware analysis report

Static analysis result for SHA-256 3541718e82e4dae3…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 07:47:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ab3d05e3fe476aa39f459fcd0f6fb4f3 SHA-1: 7c259131d7ab4d5d7b22a0a06c6d8e1441341407 SHA-256: 3541718e82e4dae30a44e83796f20dbffad06dcea163152b23c7d1bd2649d545
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on what appear to be free generators or hacks for popular games. The primary link, http://netcdn.tw/app/431946152/bux-free-robux-game-hack, is flagged as a malicious redirector. The document body and heuristics indicate a social engineering tactic to trick users into visiting these sites, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/bux-free-robux-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/treelands-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-vehicle-simulator-hack-client_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/pokemon-go-free-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-robux-hack-on-computer_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-make-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-without-password-or-email_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-bedrock-minecraft_GM479516143.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_off00002fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD5 22812 bytes
SHA-256: 2ea5abd868b4cc3405daa8fb696cc800c5cf4c111c3c113267a08e7c65b51d78
font_01_sfnt_off000062fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62FB 18716 bytes
SHA-256: 387288f024d8c8f54f23c256e97e071e9b3801b919dc08d0a5cbca9b70f610f0

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