Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c141c79cb90a1d3…

MALICIOUS

PDF

44.7 KB Created: 2021-06-11 13:41:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f1bcdf37926c6da87b35f089e1958157 SHA-1: 6563dc9ee411f5b633af6d61ab33eb871ac06d97 SHA-256: 5c141c79cb90a1d35f289906fa7669e00c31633e9e342409bbe804628b969ab1
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-confidence heuristic indicating it links to a 'free generator / game hack' lure, specifically pointing to the URL https://netcdn.tw/app/431946152/invisible-hack-roblox-game-hack. This suggests a social engineering tactic to trick users into visiting a potentially malicious site. While no scripts were extracted, the embedded link and the nature of the lure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/invisible-hack-roblox-game-hack PDF link annotation
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spain_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/roblox-tower-of-hell-hack-script_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hack-spin_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/easy-robux-today_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-obc-roblox-pastebin_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/roblox-gang_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/give-free-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/my-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_004_off00004fbb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FBB 25596 bytes
SHA-256: 08f65fcd8e171d7e42137f1400d1a3f8cf75941b77382e7dc725b32936be0161
font_01_sfnt_off00008ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA0 18416 bytes
SHA-256: b162d384d9466b8a8954a5e9d2e1aa4488e96a33e2f3482f8dcdc61adaa065f3

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