Malicious PDF — malware analysis report

Static analysis result for SHA-256 79efb4e2f20faef3…

MALICIOUS

PDF

35.2 KB Created: 2021-07-08 11:54:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 93f612d0d95c5a671e0a55654cdf5c72 SHA-1: 6a45cb2a934236e62b92bca369531195a1d6dcaf SHA-256: 79efb4e2f20faef32031e79dc521fbcf3a20f026e7043eb0687535f84848bbc2
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO link farms. The primary URL, http://netcdn.tw/app/431946152/free-robux-on-phone-game-hack, and others suggest a lure for free virtual currency or game items. This pattern is indicative of a phishing or scam campaign designed to redirect users to potentially malicious sites.

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.tw/app/431946152/free-robux-on-phone-game-hack
    • http://collectionsuncovered.com/media/storage/editor/files/minecraft-realms-free-codes_GM479516143.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/get-free-robux-without-doing-anything_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-glitch_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-place_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/is-it-possible-to-get-free-robux_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/master-8-ball-pool-free-coins_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-generator-2021-robux-hack-no-survey_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/links-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/free-spins-on-coin-master-game_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-robux-hack-no-survey-mac_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/hack-lecteur-roblox_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-hack-apk-2021-ios_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-get-100-free-spins-on-coin-master_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/robux-hack-2021-real-no-human-verification_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/welcome-to-robloxwin-com-earn-free-robux_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/how-do-you-speed-hack-on-roblox_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-hack-miners-haven-roblox_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-skin-free_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-gift-card-for-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003409.bin
fdf88fb085ae621af448f3cbe4efda979cbb3cd8ed04e69a419e900fc68122fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3409 22124 bytes
font_01_sfnt_off000064c7.bin
3bc7039bf1a02ee44cf77d87306d68fb788e2fdb5082ebb4bdc7c743d7253944		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C7 19036 bytes

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