Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fb873d0043010f…

MALICIOUS

PDF

42.1 KB Created: 2021-05-14 09:43:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0c365b936a15b30af1681129a82ca8e0 SHA-1: 8ef49c184f3c24558ba49ce045b527a6f14dd55c SHA-256: c5fb873d0043010f1283b2ee80d18223c5e629449f4b193d2bb47a92a7bb379d
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to game-related cheats and hacks. The primary URL, https://netcdn.xyz/app/431946152/easy-roblox-today-game-hack, suggests a lure for obtaining in-game currency or cheats. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into clicking malicious links, likely leading to malware downloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/easy-roblox-today-game-hack PDF link annotation
    • http://gc-sistemas.com.ar/images/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-hack-pro-gamers-com_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/minecraft-windows-10-edition-hacked-client_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/roblox-rape_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-hack-apk-ios-download_GM406889139.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
stream_003_off00004698.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4698 26136 bytes
SHA-256: 0ecf3f7f0527b82a2403c09ee57df7078536af2a08c6f8f7cb254ba44038e65a
font_01_sfnt_off00008198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8198 18364 bytes
SHA-256: e553aa4dc1eeda8b8c5a317bba368be2d7717273b9b6ea138d4861a68924f7c9

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