Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e1da4600afc7a7…

MALICIOUS

PDF

37.1 KB Created: 2021-05-11 23:04:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9dceda508f8e8c77e0f1d337671552dc SHA-1: fcd0370c48ce3d12666c16bbd1f650d612cc13c3 SHA-256: d3e1da4600afc7a7cab3c7cf656db215ddc5adb22be61384e42d6994714885b0
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure for a "Coin Master Free 400 Spin Link" which links to a suspicious URL. The document also exhibits characteristics of a fake CAPTCHA or human verification prompt, intended to deceive the user into further interaction. The primary malicious URL identified is likely used to host a second-stage payload or phishing content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0313

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/coin-master-free-400-spin-link-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000033d9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33D9 26140 bytes
SHA-256: 24b76309eac413787b80c67c7469c5380a125f3bcc7387b850d6df86cc36040d
font_01_sfnt_off00006f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F82 18292 bytes
SHA-256: 505b5c60595e7dab75bf8e15101a091f127ed76b3b64336be73d354ea9943c57

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