Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e5d32ab172c417…

MALICIOUS

PDF

34.1 KB Created: 2021-06-21 18:09:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8bf583a7a6e3094832530e97e8c32263 SHA-1: 541d29497a869ad59c3a03cdcdf9907744af496c SHA-256: a7e5d32ab172c4171782dc55dfbc531e463e0d66af10d58528dbe95b7fe2fd71
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document employs a lure of 'free Robux' and game hacks to entice users to click on malicious links. The document contains multiple links to external websites, including one that appears to be a redirector for game hacks. The ML classifier also flagged this PDF as malicious, indicating a high probability of malicious intent. The primary attack pattern involves social engineering to drive users to potentially malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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 http://netcdn.co/app/431946152/earn-free-robux-for-roblox-2021-game-hack PDF link annotation
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-vip-roblox_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/snapse-hack-roblox-2021-anti-ban_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-tiktok-followers-generator_GM835599320.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/good-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-robux-android_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/minecraft-mod-menu-apk_GM479516143.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
font_00_sfnt_off00002fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA7 21792 bytes
SHA-256: 37745f4752e8c411c4992dbc68891f5b9fe9c1ccd68b5e0d7d996c00ffbad046
font_01_sfnt_off00005fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB7 19192 bytes
SHA-256: 4f28da87749513701cf9675d491b69ff8f957990b66b0ad2ed25455c1b085999

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