Malicious PDF — malware analysis report

Static analysis result for SHA-256 de943fca5361aba5…

MALICIOUS

PDF

47.0 KB Created: 2021-05-16 13:42:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: dc28ed33b0fcc582e74bd06547eaf672 SHA-1: 5d83c7df07f71c314433fc3d6589a5e3390d1429 SHA-256: de943fca5361aba50bad27df06d3a26a604cd7842e0810175e17007c32753076
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it's a lure for game hacks and free accounts, specifically linking to a URL associated with 'free account roblox with robux game hack'. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/431946152/free-account-roblox-with-robux-game-hack PDF link annotation
    • https://xiangquan.com.tw/image/data/files/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/www-robux-com_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-roblox-toys_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/village-4-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-games-like-roblox_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b99.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B99 27500 bytes
SHA-256: 15906ffc8dda88fe41e093be8e6a0ae78afb73a1da36e3720fd931df120115d4
font_01_sfnt_off00008a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2E 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9419 18676 bytes
SHA-256: 668999cf9284642de193c24d0ad86807d097fd3a0f3919542938043f8a05e142

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