Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdbbdc014f9cc62…

MALICIOUS

PDF

34.8 KB Created: 2021-06-20 12:42:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7854487d2b06cc177fcbbab70173d17b SHA-1: 988c4336615fe631865b3fc8ff53b78d114d657b SHA-256: 7fdbbdc014f9cc62e586ca062925ebf4a4bf2cbd48ec7d905fa628283704264c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector domains, specifically advertising free game items and accounts, which is a common lure for malware distribution or phishing. The primary redirector URL is http://netcdn.co/app/431946152/free-roblox-accounts-with-lifetime-obc-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users to potentially harmful content.

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/free-roblox-accounts-with-lifetime-obc-game-hack In PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/how-do-u-undo-someone-hacking-ur-roblox-acc_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-hack-download_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/speed-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-free-download_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-spin-coin_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-hack-tuts_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/www-free-robux_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-robux-script_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/roblox-dead-winter-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/real-working-coin-master-hack_GM406889139.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_off0000310f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x310F 21864 bytes
SHA-256: 1ce347dcd4ff93529ca21f37da9f7d27fc558b61d529b5ee4e6e05c1dbcc8bb6
font_01_sfnt_off00006164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6164 19640 bytes
SHA-256: 407fce1d0f6c4ea88c03e3af39ef9217fa497b573be3a4f011a4c831021b289d