Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c9f9c12c68d23d…

MALICIOUS

PDF

36.6 KB Created: 2021-05-23 20:12:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f2c61cc5638bfceb27f65c0458365427 SHA-1: b179c9a6f7f0100e81785dcdd2f251aaf7af506e SHA-256: 84c9f9c12c68d23d24434180c275b7588b3d70834fd357661f961b560e4335fc
162 Risk Score

Malware Insights

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

The PDF document contains a high-severity heuristic indicating it links to a 'free generator / game hack' redirector, and also displays a fake CAPTCHA to trick users. The document body and embedded links promote 'Buy Robux Free' and 'Roblox Generator', strongly suggesting a social engineering lure. The primary malicious URL identified is https://netcdn.xyz/app/431946152/buy-robux-free-game-hack, which is likely used to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/buy-robux-free-game-hack PDF link annotation
    • https://www.tiancom.com.tw/upload/files/without-pokemon-go-free-account_GM1094591345.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-robux-without-verification-or-survey_GM431946152.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_off00003203.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3203 26824 bytes
SHA-256: ae0b7753411e7ee0f31ac25a00e3603f30b274e13a125fd448fd161ec3aef0ac
font_01_sfnt_off00006dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD9 18196 bytes
SHA-256: cb12c4d5dde36c76c1d8ec5571b03ead83a0fa8ffdaffe515056ff0ebc75f1e1

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