Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cd79d459ab0644…

MALICIOUS

PDF

43.3 KB Created: 2021-04-23 18:43:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c1c2eeef1433380383965cfcf963f939 SHA-1: a235b1ef7ad0239a3f541c46c2f013ef0a5230bc SHA-256: 45cd79d459ab0644f1e5af5acfcfa85c81f13a3974fa308e59361bbdbb8d1f96
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 0.9936

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 https://netsecure.top/app/431946152/free-robux-promo-codes-2021-july-pastebin-game-hack PDF link annotation
    • https://sparkthis.org/ckfinder/userfiles/files/free-admin-ad-roblox.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/roblox-snyapse-free-dec.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/hack-roblox-accounts-password-traced.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/roblox-free-robux-website.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/free-robux-does-not-work.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/hack-robux-free-pastebin.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/best-free-gun-models-for-roblox.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/20-robux-free.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/roblox-blox-pice-hacks.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/hacker-shirt-for-free-roblox.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
stream_003_off000040c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x40C3 29620 bytes
SHA-256: 778afafe9ac0284538781752e33cf2b6d55f1ce8927f7cad47c9b1917dd1e304
font_01_sfnt_off000082cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82CC 19876 bytes
SHA-256: 6e3ded19366ba3e5eb0134d9a6d1d2e5be213dfef4ece626a840a8c9724e5ba7

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