Malicious PDF — malware analysis report

Static analysis result for SHA-256 620cf6dc33745fa9…

MALICIOUS

PDF

43.5 KB Created: 2021-05-13 20:31:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 232bbd8af1dec3ba654f8ef88ad5f0fc SHA-1: ee8475b45878941e9dabcc1145dba36a4b3c8b52 SHA-256: 620cf6dc33745fa96bcf2f4a01598abb749e419ba7dad82c5cb88112780bfbb1
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains embedded URLs and a call-to-action phrase, impersonating brands like Outlook to lure users into clicking a malicious link. The primary malicious URL, https://netcdn.xyz/app/431946152/free-robux-legit-game-hack, is associated with a credential phishing lure. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • 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/431946152/free-robux-legit-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/431946152/free-robux-legit-game-hack PDF link annotation
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/coin-master-link-app_GM406889139.pdfIn PDF document text
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/spin-coin_GM406889139.pdfIn PDF document text
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/minecraft-font-free_GM479516143.pdfIn PDF document text
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/coin-master-game-hack-link_GM406889139.pdfIn PDF document text
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://www.arabianlasdiamond.com/uploaded_files/userfiles/files/totally-free-coin-master-spins-2021_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_off00004c07.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C07 25504 bytes
SHA-256: c12ff295e6af5bf20a871ef711c931f08d0807b8ed93c3d2040a844a74ed99a5
font_01_sfnt_off000086c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86C6 18528 bytes
SHA-256: aa02e962ea97e6ca8489eff7fd27dc9c81bb0b76c5ed523337a23ffa677521ed

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