Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ea1dba0efb0929…

MALICIOUS

PDF

45.2 KB Created: 2021-06-03 14:29:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6321b107b1df86d4aabb60ba17732251 SHA-1: e95f3ebc75d4dad745e4e83076f0cf30299c9c1e SHA-256: b4ea1dba0efb0929258bda2b4d4bd69b9e98553fe05275a800734a2eefb92ee7
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.online/app/431946152/roblox-instakill-npc-hack-game-hack PDF link annotation
    • http://www.library.gkigadingserpong.org/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-spin-160-pro_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/earn-rbx_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_off000052a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52A8 25876 bytes
SHA-256: edfceb35933b982c3fde2ef0763739f5ac0981d126a64ad40d91713c1fa93342
font_01_sfnt_off00008cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CEF 18580 bytes
SHA-256: ef177c88a0c1cab67368876db623f6ad7b0764fbcac1949e1b313e65d20c06cb

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