Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae2838ca221874b…

MALICIOUS

PDF

37.8 KB Created: 2021-05-21 10:40:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5772bcfc6c606b6e56fa688764890558 SHA-1: 89b00879a0b17f834952c15e27bb5d14c41e9d5a SHA-256: cae2838ca221874b67ad77c8a38b24744c25ce58a54b4f9506cfa82ab57581d4
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 malicious score 0.9407

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/431946152/promo-codes-to-get-free-robux-game-hack PDF link annotation
    • http://apcupschennai.com/images/free-robux_GM431946152.pdfIn PDF document text
    • http://apcupschennai.com/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://apcupschennai.com/images/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://apcupschennai.com/images/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://apcupschennai.com/images/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • 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_002_off000036aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36AA 25408 bytes
SHA-256: d9b6307a209a437e676042e19342f32f1fff3ba6f3e7d46a4f68a2e5fcf9fd8d
font_01_sfnt_off00007161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7161 18704 bytes
SHA-256: 994ba2c21992eebcab5dcb0bf7b99b22a17e2009da779e2696cdc2096136ed4a

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