Malicious PDF — malware analysis report

Static analysis result for SHA-256 44530981687f8b07…

MALICIOUS

PDF

38.4 KB Created: 2021-05-14 02:05:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1c0dfc3280b7ea2af417e12db2e1bc0c SHA-1: 80c777970eea44a3725f047ba1329d4bde0253c8 SHA-256: 44530981687f8b07cd70683bc130fe9984afb7d65b47bde5008bab0899b78a95
92 Risk Score

Malware Insights

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

This PDF document was flagged as malicious. It uses a fake-CAPTCHA lure. 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 clean score 0.0127

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-hack-app-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003414.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3414 24536 bytes
SHA-256: 1d3a04a9059ba94a877addc5a386a3ebb2bda09f674cd6c80d5fe37f8649cecf
font_01_sfnt_off00006b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B74 2944 bytes
SHA-256: fcfcd28869b8d6c7503d63ed8d48371ec5b580fea2733193e2acbb82b3d30a76
font_02_sfnt_off0000759e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x759E 17892 bytes
SHA-256: f939fda97690d6a809d743b342add8ec97984f5e978608423f32dd39679c4d64

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