Malicious PDF — malware analysis report

Static analysis result for SHA-256 a697c42b6fbbaf33…

MALICIOUS

PDF

37.7 KB Created: 2021-05-21 10:37:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 20304cad55643b0a111e835e0438df0c SHA-1: 148722fb3450f1c0131d41ce2b551b6024186b23 SHA-256: a697c42b6fbbaf33580aed9f1cadd944a8dc96741bd04ad827925d0abfbf2dee
122 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to sites offering 'free generators' or 'game hacks', a common lure for social engineering. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a browser extension or update, which is a typical method for malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit user interest in free items to facilitate a malicious download or redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7010

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/tiktok-viewer-free-game-hack PDF link annotation
    • http://bemviverclin.com.br/images/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003135.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3135 24348 bytes
SHA-256: 74c250cceee483d2ea8bec49cc5e1d94a91cdbb78c1c6cbc30c8e3e06b2d96d7
font_01_sfnt_off00006937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6937 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00007321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7321 17752 bytes
SHA-256: 03cae80738042903ed7303e5923c2b1ca7393d04b72c6adefe1e53c55c9a8aab

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