Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3c486527d849f0…

MALICIOUS

PDF

36.4 KB Created: 2021-07-10 01:09:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e2c7f2806926384f4b6552bd3af6e52e SHA-1: 75c1ba9d262b00f631c8d1bbe7490c23936d10cb SHA-256: 5a3c486527d849f0f634c85d1785c75a7b4b238236a586cffefa744bbd2f7266
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator' and 'game hack' lures. The primary redirector URL is http://netcdn.tw/app/431946152/how-do-u-get-free-robux-2021-game-hack. This indicates a phishing or scam attempt designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the embedded links are the primary vector for this 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.tw/app/431946152/how-do-u-get-free-robux-2021-game-hack In PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/how-to-hack-get-crushed-by-a-speeding-wall-roblox_GM431946152.pdfIn PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/5-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/roblox-sign-up-free-account_GM431946152.pdfIn PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/free-minecraft-com_GM479516143.pdfIn PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/free-attacks-coin-master_GM406889139.pdfIn PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/free-vpn-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/free-robux-website-no-password_GM431946152.pdfIn PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.alajwakh.com/uploaded_files/userfiles/files/best-hacked-client_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_off0000354a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x354A 22544 bytes
SHA-256: 5654e09f49af828853c2c05a9c0ab3300888d839d5e53b4d6e8e1a5234b793ca
font_01_sfnt_off000067c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67C2 19556 bytes
SHA-256: ee909949778bcc1eaeaae663f07e5a0770d7aed4eef67476ef7171e54895eba2

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