Malicious PDF — malware analysis report

Static analysis result for SHA-256 286e6a799b94a664…

MALICIOUS

PDF

43.0 KB Created: 2021-05-18 05:08:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 90d31ca288ba767d101ded9a36e37109 SHA-1: c01e267e0932ab4f87410fa874e88a5a6b0fe01a SHA-256: 286e6a799b94a664cabb0e440ab253b59c13ceb542420a93a3c5c101b3d89646
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games like Roblox and Coin Master. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links indicates an attempt to lead the user to a malicious website. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/roblox-website-robux-game-hack In PDF document text
    • http://achauco.vn/public/upload/files/free-robux-net_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/www-roblox-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-hacked-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-spins-coin-master-links-blogger_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/robux-online_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/easy-robux_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_003_off000048da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48DA 26388 bytes
SHA-256: ed12bce26f1337ee38f40f5e8ff30f734bf2ec1cd0e845bddd5f87e0b32b8188
font_01_sfnt_off00008580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8580 18348 bytes
SHA-256: cc91b2fc9b75ec06329357e94e6432728e351a563ac2c83234cad17065899ff2