Malicious PDF — malware analysis report

Static analysis result for SHA-256 a316c7333f3049eb…

MALICIOUS

PDF

37.5 KB Created: 2021-05-17 09:00:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5c6dc1f34f3a482610139f27c1be2c89 SHA-1: 785515e2473238574cb9aad26bd5f817e5c33deb SHA-256: a316c7333f3049eb56eed957d7026daf0b0699ccb498687a02148ae760877ab9
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure related to 'free coins and spins for Coin Master' and a fake CAPTCHA prompt, aiming to trick the user into clicking a link. This link, 'https://netcdn.xyz/app/406889139/free-coins-and-spins-for-coin-master-game-hack', is identified as a malicious redirector. The document's structure and content suggest it is intended as a phishing or scam document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-coins-and-spins-for-coin-master-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000037e8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37E8 25544 bytes
SHA-256: 1e7bc1b35ae1407e4b2f4bd87cb3f811f5443ec7fec07ca3125b65999a81d77d
font_01_sfnt_off0000720a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x720A 18060 bytes
SHA-256: f1068137021f01f6b5cc3550273fdf5362b49e27ffe305b66dd7920a08d48120

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