Malicious PDF — malware analysis report

Static analysis result for SHA-256 219aec00aa2167e2…

MALICIOUS

PDF

45.8 KB Created: 2021-06-03 06:57:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 63c8b58a7e147acd42ef85b9667c5c0e SHA-1: 757244ac44519131fa98249d660d47751b825d54 SHA-256: 219aec00aa2167e2db4a4257ffa9c0ac6951f134abfca877f0d882c96aa05bdc
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF document employs a 'free Robux' and 'game hack' lure, impersonating Microsoft to trick users into clicking links. The primary link, https://netcdn.online/app/431946152/free-robux-websites-no-human-verification-game-hack, does not match the impersonated brand and likely leads to credential harvesting or further malware. The ML classifier strongly indicated maliciousness, and the PDF structure contains multiple external URLs pointing to similar scam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/431946152/free-robux-websites-no-human-verification-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.online/app/431946152/free-robux-websites-no-human-verification-game-hack PDF link annotation
    • https://htdvn.com/public/upload/files/free-robux-scams_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/village-3-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-svg-free_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-earn_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-free-followers_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_off00004f2d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F2D 27848 bytes
SHA-256: 0fd79c61992a96ff4bbf8fb5c34139d7f368f9363c6ef2276ad015d1990b60f8
font_01_sfnt_off00008e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E59 19056 bytes
SHA-256: b278ed256549c6e4f6c448dba943d0e72c7f64ebe7340c12334ea4705f26c648

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