Malicious PDF — malware analysis report

Static analysis result for SHA-256 584b4924b5fc617e…

MALICIOUS

PDF

33.5 KB Created: 2021-07-05 02:10:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 248bd7855676aa6c238a5efd49cbc9b7 SHA-1: 7066226f010e1f1a062b423744412460364e009e SHA-256: 584b4924b5fc617eb3266f93fbb1caf79044b550b145f35d3e26cbdeb0975a93
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are presented as 'game hacks' or 'generators' for popular games. This indicates a lure to trick users into visiting potentially malicious sites or downloading further payloads. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/479516143/minecraft-images-free-game-hack PDF link annotation
    • http://sellitafrica.com/media/storage/editor/files/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/roblox-free-models_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-appsfor-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/pubg-uc-voucher-redeem_GM1330123889.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/no-robux_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/robux-come_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/como-usar-los-modelos-de-biblioteca-en-roblox-hack_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/roblox-free-play_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-robux-pc-2021-not-patched_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/roblox-shirt-template-transparent-free-shipping_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-hacks-that-actually-work_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_off00002ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF9 22436 bytes
SHA-256: 3198771ae867b839937561f0e87ef2cbbaf8e99b75df7eb16d5d70eea64b6c9d
font_01_sfnt_off00006100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6100 18116 bytes
SHA-256: 76604dd5740139514d3fd46c2a9d9c838f52c59b348f00b4ee9f07d20b77a693

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