Malicious PDF — malware analysis report

Static analysis result for SHA-256 738acfdf7c70b691…

MALICIOUS

PDF

47.9 KB Created: 2021-06-08 14:16:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 957736b9d509ffd77964d5642ae22b9e SHA-1: 27b3ef6d0d314d78c13cbe0e0edb415b75c46e8b SHA-256: 738acfdf7c70b691d11f929ff976674672f5c72242bd451b8825c77a5e7acc01
102 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA lure to trick users into interacting with malicious links. The presence of multiple URLs, including one pointing to a potential exploit or scam related to 'Robux', suggests a phishing or scamming attempt. No scripts were extracted from this sample, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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-add-robux-to-usesed-roblox-card-cheat-game-hack
    • https://inspiration-modellbau.de/images/coin-master-hack-tool-access-online-generator_GM406889139.pdf
    • https://inspiration-modellbau.de/images/how-to-download-minecraft-hacks_GM479516143.pdf
    • https://inspiration-modellbau.de/images/roblox-catalog-free-wings_GM431946152.pdf
    • https://inspiration-modellbau.de/images/robuxy-com-free-robux_GM431946152.pdf
    • https://inspiration-modellbau.de/images/free-robux-games-on-roblox_GM431946152.pdf
    • https://inspiration-modellbau.de/images/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdf
    • https://inspiration-modellbau.de/images/how-to-buy-robux-for-free_GM431946152.pdf
    • https://inspiration-modellbau.de/images/roblox-free-hair-girl_GM431946152.pdf
    • https://inspiration-modellbau.de/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdf
    • https://inspiration-modellbau.de/images/hack-roblox-download_GM431946152.pdf
    • https://inspiration-modellbau.de/images/free-robux-gift-card-hack_GM431946152.pdf
    • https://inspiration-modellbau.de/images/robux-generator_GM431946152.pdf
    • https://inspiration-modellbau.de/images/get-more-robux_GM431946152.pdf
    • https://inspiration-modellbau.de/images/google-how-do-you-get-free-robux_GM431946152.pdf
    • https://inspiration-modellbau.de/images/how-to-hack-someones-minecraft-account_GM479516143.pdf
    • https://inspiration-modellbau.de/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • https://inspiration-modellbau.de/images/roblox-anti-crash-hack_GM431946152.pdf
    • https://inspiration-modellbau.de/images/free-coin-master-spins-blog_GM406889139.pdf
    • https://inspiration-modellbau.de/images/minecraft-free-trial_GM479516143.pdf
    • https://inspiration-modellbau.de/images/how-to-get-20210-robux-for-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f45.bin
41cf61fbebf3e3b0ec640f98be556fa5586e591a92c61c874c680e3d5bec79bf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F45 28140 bytes
font_01_sfnt_off00008cc0.bin
d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC0 2820 bytes
font_02_sfnt_off0000965b.bin
3876225e9baf9de205a89784573299a9a34e60224acdc0ce3875408a90f52ab6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x965B 18944 bytes

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