Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c337cf46f90f33…

MALICIOUS

PDF

47.1 KB Created: 2021-06-07 13:48:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d3a65b9358660c9dba0516ed4fc059ec SHA-1: 6c76ddd02bd60e7a5da3aff7dbc9214a8933d7da SHA-256: f3c337cf46f90f331d42b07b862be012e691ebcf3f7f7734274b3dc5e6e91449
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free game currency, directing users to a malicious URL. The ML classifier strongly indicates maliciousness, and the embedded URL is associated with game hack lures. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/ways-to-get-robux-free-game-hack PDF link annotation
    • http://katalog.gemalibrary.net/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-admin-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/robux-free-online_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/wurst-client-download_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-handbook_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/tiktok-free-dance_GM835599320.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/hack-coin-master-game-apk-download_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/hack-coin-master-xyz_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-codes_GM431946152.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_004_off000052c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C2 24452 bytes
SHA-256: 25d070b7d22f8061478194adce3e0d948905f21d7b07fa0450b42ed499644d26
font_01_sfnt_off00008a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A30 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off000093e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93E1 18724 bytes
SHA-256: c3b9491117f98fd82bccd26ae777fa7ca9977d02418e0a88a1c335789d29c412

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