Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd73b6c857edd825…

MALICIOUS

PDF

41.9 KB Created: 2021-05-12 22:49:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 42bdd0275986b2cd4ef557ad30e313d7 SHA-1: 082dd1f4345b6f3452d2a8d6a09e2a250a1a7800 SHA-256: cd73b6c857edd825b4b4f7f88cf710b6cb7b77cfc6da33d206c16e1d04e15934
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/free-spins-coin-master-app-iphone-game-hack PDF link annotation
    • https://vstarnippers.com/images/roblox-tracker_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/coin-master-free-spin-best-link_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/free-roblox-app_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://vstarnippers.com/images/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/fbchampion_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/robux-com-free_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/free-robux-download_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/toolbox-mod_GM479516143.pdfIn PDF document text
    • https://vstarnippers.com/images/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/coin-master-apk-hack-35-8_GM406889139.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_off000049c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49C0 25012 bytes
SHA-256: 05f4a02705875c497fb62b44e3976fb210121775ed961494bf6b061234834498
font_01_sfnt_off00008222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8222 18052 bytes
SHA-256: 7db014aa73aecb4a62ca3f56ec9846345f14780ad2c21ef3ad65269841492b24

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