Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78aca4f54ae5f90…

MALICIOUS

PDF

36.5 KB Created: 2021-05-22 09:35:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e4dfc3e56fa0b1512df274df4437d35f SHA-1: e0ec82f4a98b1a7e9e623ba4e021ac25b8e23d95 SHA-256: f78aca4f54ae5f90b56ff9adcf6c38b9fa34e34e16d11a64d9e17a5a1c6df8cb
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 0.9492

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://netcdn.xyz/app/835599320/tiktok-followers-for-free-game-hack PDF link annotation
    • http://medinup.pt/images/coin-master-heaven-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/heroes-online-roblox_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/to-get-free-robux_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
stream_002_off000034cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34CF 25820 bytes
SHA-256: d4418dd21fedc9ce2dfa59619b4e11d4fb416e6c2318644dd1378f1374d5f78d
font_01_sfnt_off00006f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F50 17692 bytes
SHA-256: 1b1e1c30a9592b0fb91196253d93c27419259905b41c1e14a3654a7d7056ebb4

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