Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4da25da729d2552…

MALICIOUS

PDF

35.1 KB Created: 2021-06-22 18:09:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 99a74f992eec4c8a3148623762985b3e SHA-1: df2f8a755a4485839155c11cb4cfefac8f0b8224 SHA-256: e4da25da729d25529d1cee4ab4cd70a871aa2bbb1d2b521df2acbb7b044e43de
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors and other PDFs, all masquerading as game hacks or generators. The primary lure is 'Get Free Robux In Robolx', directing users to http://netcdn.co/app/431946152/get-free-robux-in-robolx-game-hack. This indicates a phishing or scam campaign designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the embedded URLs and the nature of the lures strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/get-free-robux-in-robolx-game-hack In PDF document text
    • http://achauco.vn/public/upload/files/woman-roblox_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-get-free-robux-no-download-2021_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-tiktok-likes-and-views_GM835599320.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/robux-get-com_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/minecraft-build-hacks_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_off000030d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D5 23072 bytes
SHA-256: 8fc1406c41837023ff1fda4fae222efda3c8e590b0a588d9f35fb99b4dbbdfa8
font_01_sfnt_off000064be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64BE 18896 bytes
SHA-256: e4cb4d7cd37b4ac8f0e0cdc6a129462ce790d1e3b661f5d92e9fc9d911f56984

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