Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03a6e3c8ead0939…

MALICIOUS

PDF

45.7 KB Created: 2021-06-09 06:36:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 224a68875f352064600b00c343dabb5b SHA-1: d8ebb9d6093c5ed7539b404ad263f1479a8e7277 SHA-256: f03a6e3c8ead09398ebe75a3685e9e747f46e81ef4faadd7e788f7664ce9911e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, many of which are structured as a link farm. The document also presents a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The primary URL identified is https://netcdn.tw/app/431946152/free-roblox-promo-code-game-hack, which likely serves as a gateway to further malicious content or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/free-roblox-promo-code-game-hack
    • http://cintabaca.org/katalog/repository/real-working-coin-master-hack_GM406889139.pdf
    • http://cintabaca.org/katalog//repository/pokemon-go-x-free-download_GM1094591345.pdf
    • http://cintabaca.org/katalog/repository/how-to-get-free-hair-on-roblox_GM431946152.pdf
    • http://cintabaca.org/katalog//repository/coin-master-70-spin-link-2021_GM406889139.pdf
    • http://cintabaca.org/katalog//repository/download-minecraft-bedrock_GM479516143.pdf
    • http://cintabaca.org/katalog/repository/free-spins-coin-master-links-app_GM406889139.pdf
    • http://cintabaca.org/katalog/repository/coin-master-spin-hack-without-verification_GM406889139.pdf
    • http://cintabaca.org/katalog/repository/free-robux-websites-2021_GM431946152.pdf
    • http://cintabaca.org/katalog//repository/how-to-hack-coin-master-game-without-verification_GM406889139.pdf
    • http://cintabaca.org/katalog/repository/free-spins-for-coin-master_GM406889139.pdf
    • http://cintabaca.org/katalog/repository/mcpe-master-hack-unlimited-coins-apk_GM406889139.pdf
    • http://cintabaca.org/katalog//repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdf
    • http://cintabaca.org/katalog//repository/how-to-get-robux-easy_GM431946152.pdf
    • http://cintabaca.org/katalog//repository/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdf
    • http://cintabaca.org/katalog//repository/free-robux-not-a-scam_GM431946152.pdf
    • http://cintabaca.org/katalog//repository/hacked-roblox-game_GM431946152.pdf
    • http://cintabaca.org/katalog/repository/how-to-earn-free-robux_GM431946152.pdf
    • http://cintabaca.org/katalog/repository/coin-master-free-link-blogspot_GM406889139.pdf
    • http://cintabaca.org/katalog/repository/how-to-download-minecraft-java-edition-for-free_GM479516143.pdf
    • http://cintabaca.org/katalog//repository/how-to-get-100-robux-for-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000556a.bin
de6f24a9ee4fee5d3166e1eddb7067e194a50f491770b0eca52d95de726d4c01		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x556A 25048 bytes
font_01_sfnt_off00008f90.bin
37dc6366b85b2b21681f71e782080a34b379b374118ed00c683f71b804e44324		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F90 18536 bytes

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