Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b0ea8f83e9d211…

MALICIOUS

PDF

37.4 KB Created: 2021-05-23 06:33:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ae4f7bcaf24a458c094b92e4595bcdf3 SHA-1: 93e8b24739af95ba059a94a1f922e698142a84e5 SHA-256: b9b0ea8f83e9d21196bf49374e63334445776b8ca29f6d6baecaa2c4df93acff
122 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'free Robux hack' and explicitly instructs the user to disable security software, indicating a malicious intent to bypass defenses. The embedded link directs to a suspicious URL that likely hosts a malicious payload or phishing content. No scripts were extracted, but the document's structure and heuristics suggest it's designed to trick users into executing further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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/free-robux-hack-no-human-verification-game-hack PDF link annotation
    • https://www.ruchya.com.tw/upload/files/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/spin-and-coin_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-co_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000030e8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30E8 26536 bytes
SHA-256: 65f8e031b7ce83e1438cc6e3a553c1af813c4108b174c8bb571f88d95d55907f
font_01_sfnt_off00006eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEF 19028 bytes
SHA-256: 768a4e91d7c3975acc2b79a699acb909e0f8bbf2befa87684aa1b4f9aecc197e

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