Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2f8516c30ba80e…

MALICIOUS

PDF

33.0 KB Created: 2021-07-19 23:05:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a36e64706783f5a1f4621983dbbf41d4 SHA-1: ac1e0e0cf74223edbcb8bbf851f35aa66a1a30a1 SHA-256: ca2f8516c30ba80e16f3b083fa53bd0703613d4dc1f3e13fbfadcf6b7c3ce059
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs a common lure of 'free Robux' and game hacks to entice users into clicking malicious links. The primary link, http://netcdn.tw/app/431946152/free-robux-no-survey-game-hack, is flagged as a redirector and likely leads to a phishing or malware download page. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit user interest in free in-game currency or cheats to initiate a malicious download or redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-no-survey-game-hack PDF link annotation
    • https://loba.com.vn/public/upload/files/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-password-hacker_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
font_00_sfnt_off00002b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B3C 22740 bytes
SHA-256: 605a1e3087df37c4b0bb1cbfa8659dd8274eed176c252c17a01fed2f969126e9
font_01_sfnt_off00005e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E24 18496 bytes
SHA-256: f1852515f6cdc259a9f9af6ce41fbc8d14471d9d90ecd59e65f12ed96f7d901b

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