Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cde2d7ccd08db4…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 18:53:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 89d8caec1c320c1728146094e4a5f017 SHA-1: 84af792f541e02b255508b309373c4e289c4391d SHA-256: 24cde2d7ccd08db4327f60ab1cd124f31b795b04b83c9b14917fe9d602eeee22
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically advertising free game hacks and generators. The primary lure is the URL http://netcdn.tw/app/406889139/free-spin-link-for-coin-master-game-game-hack, which is flagged as a known malicious redirector. The document body and heuristics indicate a social engineering tactic to trick users into visiting these sites, likely for further malware delivery 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/free-spin-link-for-coin-master-game-game-hack In PDF document text
    • http://library.imz.or.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-roblox-toy-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/roblox-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/comment-hacker-sur-roblox-admin_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/roblox-inceptor-hack_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/lootbux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/roblox-weird_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/lazyblox-free-robux_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/cheat-roblox-menu_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-school-campus-roblox_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/roblox-mad-city-cheats_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-free-spin-link-list_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/gift-card-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/roblox-group-free-robux_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_off0000325d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x325D 22688 bytes
SHA-256: 107575fc616177b183339a55e1c93fd8676181ccca8d06c91606a1e72e0e537d
font_01_sfnt_off0000651c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651C 18604 bytes
SHA-256: f19d54f8b55e9054799c5fe3eb3858f8baa86cd1dd79e15d2a28d3659dcc94a2

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