Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a7c516390dda00…

MALICIOUS

PDF

46.7 KB Created: 2021-06-07 04:39:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c73ffd2f9c212e895c0d691f5979c3b6 SHA-1: 1445d80c914b2fdfdd818bf051b400a8dfa1a3bb SHA-256: 24a7c516390dda009886907e66513720da194a0976c4546cc529d7d17e2ade52
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/roblox-free-robux-hack-2021-generator-cheat-game-hack PDF link annotation
    • http://katalog.gemalibrary.net/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-without-any-verification_GM431946152.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/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-download_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-roblox-animations_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/who-to-get-free-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_off0000540b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x540B 27628 bytes
SHA-256: a3216218ce9c6d639152d2c3210946d49a9d13ffa601eef6fe9c7995d42623f0
font_01_sfnt_off0000916d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x916D 19156 bytes
SHA-256: 83929c2b20fa6f0564214755dd3057f0b1bfee99ae327d0541d0da5526b419f8

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