Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fd542fb0a0b489…

MALICIOUS

PDF

38.3 KB Created: 2021-04-22 20:59:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1129a43e21523d1c8675e69ef5c154f4 SHA-1: 5214970a4aa6a54cf0bd87518b3295729800e49c SHA-256: a8fd542fb0a0b4895b12000da14605fbdae0f4885330907bfc5a84e18d133cf9
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 0.9423

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.pro/app/431946152/free-robux-ios-game-hack PDF link annotation
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/robux-hack-real-no-survey.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/robux-free-legal.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/when-did-people-get-a-free-business-cat-on-roblox.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/counter-blocks-roblox-offensive-hacks-unknowncheats.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/free-robux-gameguardian.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_off00003b0f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3B0F 25608 bytes
SHA-256: 190bbd4fdbb10f98a8c78f76335c192f66c388be846060fa5bbfd7c542ffd11b
font_01_sfnt_off00007501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7501 18012 bytes
SHA-256: d499b17af0e09e55bf4451b32f5412a28c0f478f48c85a4a3d740ef88d957851

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