Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c605ccd8dec3532…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 07:33:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: adce17ae86e16d1c5bbbe531bac0978e SHA-1: e451942205f303a83a8a5b4ed194f68c2fd8b3a0 SHA-256: 4c605ccd8dec3532ec0886c58515b7d578da18182a579b073b281194a5255735
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors, specifically advertising free game hacks and in-game currency. The primary redirector URL is http://netcdn.tw/app/431946152/free-premium-roblox-game-hack, which is likely used to deliver a second-stage payload. The document body and heuristics strongly indicate a lure for users seeking cheats or exploits, leading them to potentially malicious content.

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/free-premium-roblox-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-no-vireus_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/hack-coin-master-apk-ios_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-hack-roblox-games-on-mobile_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-obc-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-prison-life-hack-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-hacks-2021-level-7_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-hack-stats_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-toll-free-number_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/do-you-want-free-robux-copypaste_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-with-inspect-console_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/pubg-uc-gift-card_GM1330123889.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-codes-to-get-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/como-conseguir-robux-gratis-sin-hacks-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/earn-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/blue-pants-roblox-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/code-for-free-robux-2021_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_off00002f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F0C 22312 bytes
SHA-256: 91be86b33aa6752e5f68370c423cb0e914735d067bc337c400c4509251c0b5f4
font_01_sfnt_off000060c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C4 19324 bytes
SHA-256: bffeb858734709d9e626e1cf7762beb37c79d024cf91ee5740b88d17242ac5df

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