Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4180ebf75d6e5ac…

MALICIOUS

PDF

46.0 KB Created: 2021-06-10 14:53:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d927d7ec18c87b379c21d3c1334b3a52 SHA-1: 738c6b063ebf3216ccdb84ad5deac47d6d675a8e SHA-256: b4180ebf75d6e5ac6e84d11f3fe6c45886b81446fe0c34863010f80614b3d27b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, containing numerous external links to various PDF documents hosted on 'katalog.gemalibrary.net' and a primary link to 'netcdn.tw'. The presence of a 'Download Button' heuristic and the ML classifier's high confidence score suggest malicious intent. The document body, though partially corrupted, contains text related to 'Robux Hack Tips', indicating a potential lure for users interested in game exploits or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/robux-hack-tips-game-hack PDF link annotation
    • http://katalog.gemalibrary.net/repository/haktuts-coin-master-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/freer-pro-tiktok_GM835599320.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-2021-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-today-only-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/games-roblox-hack_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000518d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x518D 26840 bytes
SHA-256: e3349c39b3b6bc13d4badebe8c8189b33dd8ea028ac9f1c5b9755921e38f3a95
font_01_sfnt_off00008c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C39 19976 bytes
SHA-256: 0122dc62659fd3eb283df120cbb7ca490ec64c7453fa3dde1ca3ec32cf733963

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