Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7411b0a21363bd1…

MALICIOUS

PDF

34.9 KB Created: 2021-06-30 12:13:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 44433e2a926e7d8519454831739bd858 SHA-1: 66e72a34bb71bf0f2c25ed0f723f34ad258fb19f SHA-256: d7411b0a21363bd154c8c18ffd87d6803ab71533947c4e93a08e834f700265d1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a link farm, suggesting it is designed to redirect users to potentially malicious websites. The document body and extracted URLs indicate a lure for 'free Robux' and game cheats, which is a common tactic for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.co/app/431946152/free-robux-youtube-robuxian-game-hack PDF link annotation
    • https://htdvn.com/public/upload/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-money-hack-amd-city_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-items-on-roblox-no-hack_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/tiktok-free-food-vending-machine_GM835599320.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-stream_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-co_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/is-bank-account-info-stored-in-roblox-if-account-hacked_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-cheat-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-card-codes-generator-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-hack-on-roblox-btools_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
font_00_sfnt_off00003287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3287 21996 bytes
SHA-256: 849f0ac4d2f1d8ccfe37cf546df5157e4c2bc9d058c50400d646215f9e14e92d
font_01_sfnt_off0000634d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x634D 19100 bytes
SHA-256: a31611fa7c63f284bedba6ff69f8a93e7bcc8fe6c03f04794e9f6a537b9dc04c

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