Malicious PDF — malware analysis report

Static analysis result for SHA-256 a393602f67a6e939…

MALICIOUS

PDF

43.0 KB Created: 2021-05-15 03:01:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b8387dc7f3c89914fc79d47e23db31b2 SHA-1: ab171d18d64a340dbe25cdfb602631d5f7034d61 SHA-256: a393602f67a6e939a6865de8be39c1bcc40e1415f8a2c665c78713d84dab3d5e
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 0.9971

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/406889139/coin-master-email-free-spins-game-hack PDF link annotation
    • http://ktn.com.br/images/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/roblox-e-free_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://ktn.com.br/images/how-do-i-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/hack-master-coin-pc_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/level-coin_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/www-free-robux_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/how-to-get-free-robux-on-roblox_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_003_off00004bdc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BDC 25708 bytes
SHA-256: c81e910e0c353681c6e30399f0139a0ac3cac8e2185389e138b572b806077977
font_01_sfnt_off0000863f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x863F 18220 bytes
SHA-256: 6abc40c27418d042928f00883f7f6ae445038055fc973b4cc9155520e44fc93a

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