Malicious PDF — malware analysis report

Static analysis result for SHA-256 662f30c3e33d9fa7…

MALICIOUS

PDF

34.8 KB Created: 2021-07-03 21:46:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: dad83629676b64bfe6b9114b34c22eff SHA-1: a51caa8d6606909c47d11dad7427404d9c22c165 SHA-256: 662f30c3e33d9fa7850a5303781fabb1633cea36b0ff5cc6a9f96629d8c7a17d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirector infrastructure, specifically advertising 'free Robux' and 'game hacks'. The document body and heuristics confirm the intent is to lure users to the URL http://netcdn.tw/app/431946152/free-robux-game-hack. This pattern is consistent with phishing or scam lures designed to lead users to potentially harmful sites.

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/free-robux-game-hack In PDF document text
    • http://perpus.unpam.ac.id/repository/hack-the-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/hack-money-lumber-tycoon-2-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-hack-tool-download_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/is-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-free-faces-from-events-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-roblox-death-sound-ringtone_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-hack-pet-simulator_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-generator-2021-no-human-verification_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_002_off00003141.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3141 22684 bytes
SHA-256: 0e8df63ef3079c7034c8c7a73a781ea3ab41129bbecb102c3ac0dd750d3030a4
font_01_sfnt_off00006411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6411 18716 bytes
SHA-256: ae86725dd70d168e8b5a24377d7effb3bd88f81667aa3e091abc0f5759eb354b