Malicious PDF — malware analysis report

Static analysis result for SHA-256 a511e75d29a4d181…

MALICIOUS

PDF

35.7 KB Created: 2021-07-02 07:33:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6aafae323e07dba9ecddd74f093527de SHA-1: 0b33f0dd455b39ab56fe3b8251d5e72c5662658e SHA-256: a511e75d29a4d181af3111a99c1249da8b4c2a516d7dd3b493b441257dbb5e52
142 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to sites offering 'free Robux' or game hacks, indicating a lure for potentially malicious downloads. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' suggests the document may instruct users to execute commands, further supporting a malicious intent to trick users into compromising their systems. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.co/app/431946152/20210-free-robux-game-hack PDF link annotation
    • http://cintabaca.org/katalog/repository/roblox-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-promo-codes-robux-free_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/i-need-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-hack-your-friends-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/tiktok-free-booster_GM835599320.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/project-delta-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/comment-hacker-roblox-avec-une-application_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-no-info-needed_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-hack-2021-download_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/get-free-roblox-today_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-robux-easy-without-human-verification_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-pet-food-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/jump-hack-roblox-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-supreme-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-robux-on-computer-no-inspect_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/synapse-roblox-free-download-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-robux-2021_GM431946152.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
font_00_sfnt_off00003495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3495 22328 bytes
SHA-256: cff061f393aa51241231263e5c183cfe6f9372c8e4dbfc2a7b046e8c27944a22
font_01_sfnt_off0000662d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x662D 19116 bytes
SHA-256: e4801cf0c164bf990cb10f1441e05263d2fd621e0b85b2999909504d0dea9ad6

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