Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8bfc6bc7b89acfb…

MALICIOUS

PDF

43.8 KB Created: 2021-06-07 09:11:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b8d0c0af792bcc81c5af3e28cbd2da08 SHA-1: 38b3fa86360eb4abe24d1a8c5b8a58e68cc5b6b7 SHA-256: a8bfc6bc7b89acfb705cccbe237b8d4c37583bca06a811424b8aa5729fdf1eb0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as a 'game hack' lure. The primary link directs users to `https://netcdn.tw/app/431946152/hack-roblox-using-command-prompt-game-hack`. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest an attempt to exploit users' interest in game cheats to redirect them to potentially malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 https://netcdn.tw/app/431946152/hack-roblox-using-command-prompt-game-hack In PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/free-roblox-gift-card-2021-live_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/client-hack-roblox-2021-download_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/pison-club-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/roblox-hack-the-streets_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/roblox-fly-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/guuudinforoblox-online-hack-for-free-robux-and-builders-club_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/free-promo-codes-roblox-2021-robux_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/how-to-get-youtube-robux-hack_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/safe-free-robux-no-password-or-human-verification_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/how-to-get-free-robux-copy-and-paste-2021_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/roblox-to-play-games-for-free_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/anti-ban-and-kick-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/hacked-roblox-face-id_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/roblox-free-robux-generator-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/free-gems-roblox_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/how-to-hack-a-roblox-account-2021-easy_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/roblox-hack-week-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_off00004fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FCC 23520 bytes
SHA-256: c873388eac1d5b992748c63d904e695674e050325d110730c05367033a4e6325
font_01_sfnt_off000084b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84B4 19644 bytes
SHA-256: d4eba3bb614e8c61ae6bd7f71e64a5fb77f9da86486c897959a1dfbd423ea1ef

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