Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4cf4687efa3d85…

MALICIOUS

PDF

33.9 KB Created: 2021-07-06 17:27:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2d11eb828aa5ae4a185d8ae7d49c99bb SHA-1: 8feef31a77634959057016fe85b015759f21850f SHA-256: ac4cf4687efa3d85938b70dc9e76ea6f133ce9965294a479429d1f90104490cc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and free generators, directing users to a known malicious redirector. The primary malicious URL identified is http://netcdn.tw/app/479516143/minecraft-server-free-trial-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector designed to lead users to potentially harmful content, likely for financial gain or further compromise.

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/479516143/minecraft-server-free-trial-game-hack In PDF document text
    • http://library-fkip.uho.ac.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/robux-cheat-no-survey_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-walk-through-walls-in-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-hack-robux-hack-fr_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/new-btools-hack-roblox-9-5-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-shorts-free_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-wings-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/build-battle-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/gratis-und-sicher-free-robux-gekommen_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-denisdaily-shirt-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-retro-craftwars-hack_GM431946152.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_off000031e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31E6 22364 bytes
SHA-256: b1e6be75fb3c0b9e42b3cf8d1555dc5ae636f3fd7b3d6792ccbe78392e414798
font_01_sfnt_off000062be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BE 18044 bytes
SHA-256: 5a296e18dbf65f04870817c9dd6793c8643020e9f41ce66c5e33f12cc84b0da1

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