Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f31ff0cd0ddaa2a…

MALICIOUS

PDF

34.8 KB Created: 2021-06-26 08:02:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7d0491065dab00bebb02e5c0ae1265d2 SHA-1: e67defb331b36cb1c6f3bce5a2aea997ed3f5621 SHA-256: 3f31ff0cd0ddaa2a9dc62164816b88161950283b86b150b26fc61a140bbb495f
102 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are related to game hacks and free in-game currency, suggesting a phishing or scam attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ML classifier strongly flagged the PDF as malicious. The document body, though partially corrupted, also contains references to game hacks and URLs.

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/icon-free-robux-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-card-hack-app_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/como-hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-25-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-spins-coin-master-2021-glitch_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-roblox-for-free-on-pc_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-codes-december-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-roblox-game-guardian_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-van-candy-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-bee-swarm-simulator-tickets-locations-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-group_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_off000030bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30BC 22876 bytes
SHA-256: 734625a92d4a4eec74b42f5b68b10fef94780b350019c8f234ba19ee0916e0d8
font_01_sfnt_off00006408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6408 18716 bytes
SHA-256: d5d763ea3b67a2778bba061123ecb14eef05bce48cd9dce93a16759213da9ae8

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