Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6dca83304149dbd…

MALICIOUS

PDF

35.3 KB Created: 2021-06-27 15:42:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9a922436158e73a6239b727cbd2750fd SHA-1: c82685f9087749c531c380d27f3e19cc307607e7 SHA-256: c6dca83304149dbd8e5d502029dc88bb25eb664f2d71a5fdd042728f533fa068
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are disguised as game cheats or hacks, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the 'ML_NYX_PDF_MALICIOUS' score of 0.997996 strongly suggests malicious intent. The presence of a call-to-action phrase further supports this, indicating the document is designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/cheat-roblox-jailbreak-2021-game-hack PDF link annotation
    • http://opac.kolejkrim.edu.my/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/hack-para-roblox-de-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/best-free-roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-hack-client-free-download_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-sound-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/tete-de-roblox-free-to-use_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/hacking-a-fans-roblox-account-projectsupreme_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-hack-youtube_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/if-everything-in-roblox-is-free_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/hack-para-tener-robux-como-tener-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-play-roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/promo-codes-roblox-robux-free_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/games-on-roblox-that-give-you-real-free-robux_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_off0000310f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x310F 22572 bytes
SHA-256: 370912661b315b4c5e6e7c2483f51a9da8a828f9f64a5ced6674033fbd4c0378
font_01_sfnt_off00006354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6354 19612 bytes
SHA-256: 60e3ee77cd4548ed007849f586457ce38443c7b5a3913d3db64c15c125a5cb37

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