Malicious PDF — malware analysis report

Static analysis result for SHA-256 431a4cb14055e2f1…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 12:36:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 56780706058d4a4091583ad3ec62e52e SHA-1: 660678c0ae61cc6e8463255d2f05d4abfb7159d0 SHA-256: 431a4cb14055e2f19048c79b3e2abb9b235ca5a4a926ff3afd841e886bc0ee65
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lure users with promises of game hacks and free in-game currency. The primary URL, http://netcdn.tw/app/406889139/coin-master-rewards-free-spins-game-hack, is directly linked to a game hack redirector. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit user interest in free game items to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/406889139/coin-master-rewards-free-spins-game-hack PDF link annotation
    • http://lib.smklabor.sch.id/repository/roblox-free-robux-server_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-free-suit-t-shirt_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-play-roblox-for-free-online_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-be-thanos-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/god-mode-hacks-for-roblox-arsenal-of-free_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-booga-booga-instant-kill-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-hack-account-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/robux-without-verification_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-executor-download-free_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-ben-10-universal-showdown-cheat-codes_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hacked-roblox-spray-id_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-robux-hack-pastebin-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_off000032aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32AA 22508 bytes
SHA-256: c0f9772eaf20708ed3f8a3b6adfba6db54727d60fbe29ceeda88d3905982dc21
font_01_sfnt_off00006502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6502 18512 bytes
SHA-256: 6bc66a7c9124691c5dbe04e2c8d08202ba1ceeb7f14ff76ef8eff16a4b1fabf8

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