Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76d99ceace6a92d…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 20:41:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8a9045e8f5889d9f495075c6bd6fbca6 SHA-1: 80b4a0f70c27ce93d281b413d0fed53005ebe19d SHA-256: b76d99ceace6a92d4c8cc53162cbd2044445656d1bbb83399d8cefc1857ffed8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, including one identified as a malicious redirector. The document body and heuristics suggest a lure for free in-game items or hacks, which is a common social engineering tactic. The primary malicious URL identified is http://netcdn.tw/app/406889139/facebook-coin-master-free-spins-link-game-hack, which likely leads to further malicious content or malware download.

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/facebook-coin-master-free-spins-link-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-rtx-download-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-iphone_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-root-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-free-skin_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-spins-on-coin-master-2021_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_off0000308d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x308D 21996 bytes
SHA-256: 94c5b211d623ca6c99ddd6289abec118b9b65cfb279646ed7af9864944acea59
font_01_sfnt_off00006123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6123 18504 bytes
SHA-256: 82c3e55a3f16517a0e9da98b063043b0b8ffb7837822c376f9cc5fed45eb6737

Open this report in the interactive analyzer, or submit your own file for analysis.