Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3875358a5caa198…

MALICIOUS

PDF

42.9 KB Created: 2021-05-16 10:00:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0cb47d47bc93730b6571c3114de4e4a4 SHA-1: 17deec95e5557061a3a16da9084e8c91cc7b5b1e SHA-256: d3875358a5caa1982086c712897e43cbbf674e47f42984ef1bc090711a91c41c
142 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are related to 'free Robux' or 'free spins' for games like Coin Master. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to trick the user into interacting with these links. The document body and heuristics strongly suggest a phishing or scam attempt disguised as a game-related offer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/roblox-studio-free-robux-game-hack PDF link annotation
    • http://advancedaudiosystems.org/images/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/robux-no-verification_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/coin-master-free-spons-apk-2021_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/fbchampion_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/coin-master-unlimited-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/sb-game-hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/free-custom-minecraft-skins_GM479516143.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_off00004ac0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AC0 25004 bytes
SHA-256: f763e74f560605d9f84e42235756f02d56bcd9551b81a548fa86621804a5f29f
font_01_sfnt_off000084c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C7 18484 bytes
SHA-256: 5fdc582f30145a96e28329e80bd45567e2bf6a1df475cf6931e13f95db6331fe

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