Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f5664cdee4b4cd…

MALICIOUS

PDF

42.6 KB Created: 2021-05-16 16:48:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 82e7a72f97ed7f75d23dce71b8e64090 SHA-1: 643c4f60fe47a9e04dd0f8057bbab2d17168a3d9 SHA-256: 77f5664cdee4b4cd167e121e7d763924960765cad7309151ca247912d8772f9a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains numerous links, including one to a 'coin-master-unlimited-coins-hack-apk-download-game-hack' URL, and others pointing to various game-related hacks. The presence of a PDF link farm and a lure for game hacks strongly suggests a malicious intent to redirect users to potentially harmful websites or initiate downloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/406889139/coin-master-unlimited-coins-hack-apk-download-game-hack PDF link annotation
    • https://xiangquan.com.tw/image/data/files/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-links-for-free-spins_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/optifine-pe_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-wheel_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-daily-spins-today_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-gift-link-hack_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/113-hacked-client_GM479516143.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_003_off000049f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49F2 24720 bytes
SHA-256: 5da165ffce6a4b8396c3dabd9809dab27818dd941652ae60854481aab5445b0d
font_01_sfnt_off00008213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8213 18916 bytes
SHA-256: f0d587adf4f6f4957022720a1ba7dc12899eb6a2139247dd603e63f7db2e4ec6

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