Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad23598f539e53b7…

MALICIOUS

PDF

41.5 KB Created: 2021-05-24 04:14:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c9e9d593cd5fa30876434e1d57f26776 SHA-1: 2c85c00d8491e538f024ac82aca73a3e102b71f2 SHA-256: ad23598f539e53b78b282ee835ce4412ca5fa1ecbc4f2a79bcbebdbe620a8e86
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake browser/software-install 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 0.8053

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/835599320/get-tiktok-followers-free-game-hack PDF link annotation
    • http://bressanassessoria.com.br/images/minecraft-thumbnail-maker-free_GM479516143.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003052.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3052 25760 bytes
SHA-256: 96c714d919813450cf7180654fd2618b39821f8f84dffcbe0fe69eaaa46d6b46
font_01_sfnt_off00006b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B82 3372 bytes
SHA-256: dfbbf67cbc7ecc66ac4d03805ccfff7e5c1407898ea3c5e2b9241b85217ff1cd
font_02_sfnt_off00007703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7703 3120 bytes
SHA-256: 49734f51977507cba6bc8d3ad0cee0363aa119856db094427deb9cf565bb7bca
font_03_sfnt_off00008216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8216 17692 bytes
SHA-256: 8cacd57cbae25f5163b35c5b464cf1f4e6be88960ce09657a88da3590579257c

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