Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efc57f7ffc23c22…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 08:08:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cb9df78f74c1c18f1facffc89cdbe754 SHA-1: df79b03c27fdb1fa74dcdd731a46f7a0db60abe2 SHA-256: 2efc57f7ffc23c2215344f86b8db2455f3d85a20855cfe4acb959f051413ef88
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The primary malicious URL identified is http://netcdn.tw/app/431946152/roblox-zone-free-robux-game-hack. The document body and heuristics indicate a lure for potentially unwanted or malicious content, likely leading to further malware download or phishing. No scripts were extracted from this sample.

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/431946152/roblox-zone-free-robux-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-tablet-cheats_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/best-free-avatar-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/hack-client_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-kill-anyone-in-roblox-hacks-v3rmillion_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-gaben-hack_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-free-online_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-follow-anyone-hack_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-generator-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/link-hacks-madpaintball-roblox_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_off00002eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB7 22856 bytes
SHA-256: 632a569b43f2224de92b39e6b58523c89facf9c9d1dcb1c0aa4e066199e53fc9
font_01_sfnt_off000061c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C6 18884 bytes
SHA-256: ee7a09e4b3f15cc364cad973da95635941027bcad42042fb3a1cc04549a97256

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