Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b3b67551abf98b…

MALICIOUS

PDF

47.5 KB Created: 2021-06-08 16:57:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 31a18fd9559fc952a84d6a4600a13bbf SHA-1: 2c8bdd02e1ebe721f3b85194e7534af551569b54 SHA-256: e2b3b67551abf98bf411edabcc463bcbc8ba6d2e968e273e83f0f62112cfef79
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF files related to game hacks and free currency. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to trick the user into interacting with the document, likely by clicking these links. The document body, though partially corrupted, contains references to game-related lures and embedded URLs, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.tw/app/431946152/roblox-play-as-guest-for-free-game-hack
    • https://duoledesign.com/image/data/files/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • https://duoledesign.com/image/data/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdf
    • https://duoledesign.com/image/data/files/coin-master-hack-tool-without-verification_GM406889139.pdf
    • https://duoledesign.com/image/data/files/freerobuxhack-us_GM431946152.pdf
    • https://duoledesign.com/image/data/files/free-roblox-acc_GM431946152.pdf
    • https://duoledesign.com/image/data/files/coin-master-cheats-without-verification_GM406889139.pdf
    • https://duoledesign.com/image/data/files/how-do-you-get-free-robux-without-paying_GM431946152.pdf
    • https://duoledesign.com/image/data/files/free-robux-generator-without-human-verification_GM431946152.pdf
    • https://duoledesign.com/image/data/files/how-do-i-get-free-spins-in-coin-master_GM406889139.pdf
    • https://duoledesign.com/image/data/files/how-to-hack-in-arsenal_GM431946152.pdf
    • https://duoledesign.com/image/data/files/get-free-robux-com_GM431946152.pdf
    • https://duoledesign.com/image/data/files/get-free-spins-coin-master_GM406889139.pdf
    • https://duoledesign.com/image/data/files/get-me-robux-for-free_GM431946152.pdf
    • https://duoledesign.com/image/data/files/free-spins-coin-master-april-2021_GM406889139.pdf
    • https://duoledesign.com/image/data/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdf
    • https://duoledesign.com/image/data/files/how-to-play-minecraft-for-free_GM479516143.pdf
    • https://duoledesign.com/image/data/files/coin-master-card-hack-2021_GM406889139.pdf
    • https://duoledesign.com/image/data/files/how-to-play-roblox-for-free_GM431946152.pdf
    • https://duoledesign.com/image/data/files/why-you-shouldnt-trust-free-robux-scams_GM431946152.pdf
    • https://duoledesign.com/image/data/files/how-to-get-free-spins-on-coin-master-game_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e3a.bin
7b2ac64b01ffedad9fb1767cdc25ac2a01dd208ef6456e907570bd7229df610c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E3A 25116 bytes
font_01_sfnt_off0000885a.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x885A 5696 bytes
font_02_sfnt_off0000956c.bin
536746ef029180016b10674303df9b70bf6b2620163374f544b37f1543ff13dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x956C 18756 bytes

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