Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf583da6fbc8a3e6…

MALICIOUS

PDF

46.5 KB Created: 2021-06-11 03:09:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1d42140c5652720ffe6c37afc930b4c9 SHA-1: 11129867971c55c1c7c53347fd5b837b67a47771 SHA-256: bf583da6fbc8a3e65d3927bb0b8618e43597f6cc83af6a1652c60b55677741db
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with malicious links. The embedded URLs, such as 'https://netcdn.tw/app/431946152/how-to-hack-roblox-to-get-robux-2021-game-hack', suggest a theme of game exploits and cheating. The ML classifier also flagged this PDF as malicious, increasing confidence in its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 4

  • 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.tw/app/431946152/how-to-hack-roblox-to-get-robux-2021-game-hack PDF link annotation
    • https://ogm-goettingen.de/images/how-to-make-robux_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • https://ogm-goettingen.de/images/www-bloxy-world-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/apps-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/dolphin-hacks-roblox-website_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/promo-code-hack-roblox_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • https://ogm-goettingen.de/images/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/coin-master-apk_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/toolbox-for-mcpe_GM479516143.pdfIn PDF document text
    • https://ogm-goettingen.de/images/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/roblox-free-obc-lifetime-code-generator_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • https://ogm-goettingen.de/images/robux-claimer_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/how-to-hack-a-roblox-account-using-cookies_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_off00004f40.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F40 28868 bytes
SHA-256: 1d22a09aac3ca6f179b03794c20548ddf6f6630490aa6be194d109fa6ea25b03
font_01_sfnt_off000090fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90FC 18992 bytes
SHA-256: d237c3d0a796450a3321e08788533a390d44aef29d83deb4a0044a2f6722cff0

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