Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4e14c7f7fa0629…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 12:13:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5e2678dc14636c64fb0dd6ccff7e1e11 SHA-1: d1777cbd35e9b72189c56361b1df28e2b07f4ec7 SHA-256: cb4e14c7f7fa06299380caaf050bd62715fd20e02a85fea3fe28dfefc27d0cff
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that point to known malicious redirector infrastructure, specifically designed to lure users into downloading potentially unwanted or malicious files related to game hacks and currency generators. The ML classifier also strongly indicated maliciousness. The document body and embedded links suggest a social engineering tactic to trick users into clicking through to a compromised website.

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-coin-master-spins-daily-game-hack In PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-apk-hack-3527_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/viper-venom-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-private-server-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/robux-no-survey-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/black-clover-online-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-30000-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-robux-cheat-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-m-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/cyberchase-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-animation-package-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-roblox-model_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/gold-card-coin-master-free_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_off000030cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30CC 22252 bytes
SHA-256: d0214f13c2dbfe422c0e4edf7ea4bd1745203e80238191b271cd57319ff0254f
font_01_sfnt_off0000623d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x623D 18596 bytes
SHA-256: a7833972b885d34acb5ad01908fbd6133f193c29e2abbc4434009272e0e2ed6c

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