Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f8979a3dccedc8…

MALICIOUS

PDF

41.2 KB Created: 2021-04-23 15:43:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9d805c4bf89be86c14b16e2feb5adc2f SHA-1: d5060beb8c0a0b4c8a41d03e477a7d79c1b080d9 SHA-256: f5f8979a3dccedc8dc4aa05ce6c47f38f01a36aa5833f3845d38fbb27f501fe2
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 0.9941

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/hack-robux-free-pastebin-game-hack PDF link annotation
    • https://sparkthis.org/ckfinder/userfiles/files/roblox-how-to-get-free-robux-not-clicbait.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/all-free-in-catalog-roblox.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/roblox-free-iland-royal.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/100-free-robux-hack.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/hack-de-robux-2021-funcionando.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/roblox-highschool-cheats.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/roblox-farming-simulator-cheats.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/aimbot-hack-roblox-cbro.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/hack-roblox-one-punch-man.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/free-robux-does-not-work.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_off00004044.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4044 27280 bytes
SHA-256: 16852ccdea5264676e47eb0276640d116f7c58eb247a4834dec0427eee070192
font_01_sfnt_off00007dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC9 18792 bytes
SHA-256: d8a4d6914227c55fb015861ab2baeade58cd7c785e3e0fcced3a4eef791c485d

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