Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d57efe3feaebc28…

MALICIOUS

PDF

38.2 KB Created: 2021-05-10 14:02:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5a5256cb1646733e237ee3fa1de7a3e5 SHA-1: a16d06eef80bb996445496f786ad1ee38149456f SHA-256: 7d57efe3feaebc28778af262ab01fa3d2d66c27ac3934151a1524f7e58d5fdb9
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 0.9599

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/406889139/coin-master-free-spins-link-today-instagram-game-hack PDF link annotation
    • http://www.duchidicastelluccio.it/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/can-i-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/free-coin-master-s_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/how-to-get-free-robux-without-offers_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_003_off0000380b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x380B 25688 bytes
SHA-256: 8bbf81ed2c4e97c96428a82b0ebb3b98e7a3976d362422c8e8f7238b5b49f6f2
font_01_sfnt_off000071c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71C7 18960 bytes
SHA-256: c3cae131f36bdfe9c813bd150295f39ca0ceeabf3546a2df254cc03f93d9c6e3

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