Malicious PDF — malware analysis report

Static analysis result for SHA-256 405dd91f176f815c…

MALICIOUS

PDF

48.2 KB Created: 2021-06-03 03:23:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8be7be91e1b3de62d0d4ff09211daf84 SHA-1: 479622297fe3f00747e8f806c92dd428e0a4590c SHA-256: 405dd91f176f815ccd499aada1d7488e2b1ab0f1ac94eeee94bacdac0df1053c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a lure for a game hack, directing users to a URL that hosts another malicious PDF. The ML classifier strongly indicated maliciousness, and multiple heuristics identified the game hack lure and embedded URLs. The document body, though heavily obfuscated, contains references to game hacks and URLs, reinforcing the lure-based attack pattern. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/406889139/coin-master-daily-free-spins-link-2021-game-hack PDF link annotation
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/coin-master-root-hack_GM406889139.pdfIn PDF document text
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/2021-roblox_GM431946152.pdfIn PDF document text
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/free-star-codes-roblox_GM431946152.pdfIn PDF document text
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdfIn PDF document text
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdfIn PDF document text
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/roblox-2021_GM431946152.pdfIn PDF document text
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/free-spins-and-coins-coin-master_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_004_off000055e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55E7 24512 bytes
SHA-256: 2ad6da064251c61d21cc8add542dd5a8623e833fe5cd5a139bb016e50a209f1f
font_01_sfnt_off00008e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E39 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000097ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97EA 18880 bytes
SHA-256: 4ccb81aabfc378a65bbb004da1df6276046c1b1923188410bd025f5007717b79

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