Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f442b27463b2008…

MALICIOUS

PDF

43.2 KB Created: 2021-05-18 00:44:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f18afc8a49fa6875ba037be148292317 SHA-1: 3a86fe96966de47d33bed263b037900d3c8e6f1e SHA-256: 8f442b27463b200802a44be6c9d322e24cca8274e6e487dce1ffcb37ed610812
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 0.9969

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/406889139/coin-master-hack-xyz-game-hack.
  • 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-hack-xyz-game-hack PDF link annotation
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-hacked-apk-download-for-android_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/games-for-robux_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-rare-cards-for-coin-master-christmas_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-root-hack_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-coinmaster-spins_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/robux-earning-websites_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/master-coin-free-link_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_off00004b2f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B2F 24832 bytes
SHA-256: 2be34c7429dac3d28ecdf2485d9c16694704f361f7bfdf9d7adc8549a458ea7f
font_01_sfnt_off00008315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8315 19356 bytes
SHA-256: 74d7519ce1d37a4493519ebbe93fa5a3cdb5df8203880a0080b6b78a97498c49

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