Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf9c2bb4ecd46e8…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 09:55:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 451d7b33ec317ab3e146fbb39d44caa5 SHA-1: b7857defe3ddbc75ad89629c2f6627443ed06bbf SHA-256: baf9c2bb4ecd46e8130408373c211398b2dd8a282f2a9dd9da6eb441517adacb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and free generators to trick users into clicking malicious links. The primary link, http://netcdn.tw/app/406889139/coin-master-deals-game-hack, is identified as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

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/406889139/coin-master-deals-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/master-free-spin_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-apk-download-latest-version_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-the-guest-boby-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/tiktok-free-upload_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-super-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-robux-for-free-no-hacks-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-adopt-me-money-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-clothe-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/gameoffice-net-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/cm-daily-spins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-coins-and-spins-daily_GM406889139.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_off00002fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FED 22756 bytes
SHA-256: 55c9123ae00e2bcc4c56dfd3734f4e8ecb2177aa6dcb315c76a7c2dd3244dd6c
font_01_sfnt_off000062f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F1 18076 bytes
SHA-256: e98cfc4b1356863f5e7edaeb5d7889055cdac85d88bbcd02522d41b4054d315a

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