Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a788faf820f3bfd…

MALICIOUS

PDF

35.1 KB Created: 2021-06-29 01:52:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 15ce5eede30d504277582d4d87a56fad SHA-1: d98d1877357159989c7079d993c89f2fe84002f5 SHA-256: 1a788faf820f3bfd8677f567ab1e92e59480cd3c98a4c3e3b792f3b6093e9dd1
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating a large number of external links. The document body and extracted URLs suggest a lure related to game hacks and free in-game items, likely intended to trick users into downloading malware. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic further supports this malicious workflow.

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/roblox-skins-free-hack-game-hack PDF link annotation
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/roblox-shard-seekers-how-to-get-free-shards_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/tiktok-free-robux-hack_GM835599320.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/what-do-colours-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/how-to-hack-a-rv-roblox_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/coin-master-support_GM406889139.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/how-to-find-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/where-can-i-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/roblox-create-free-vip-servers_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-and-coins-2021_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
font_00_sfnt_off00003426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3426 21964 bytes
SHA-256: 2e35a9cfa6e128997e91975fafa88095eb9609274c5a2201904bc5d8ce2914d8
font_01_sfnt_off0000648e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x648E 18940 bytes
SHA-256: e2620899eafd72e29ba301feaa5b39854b861610e1bbfb4bd01e4a40051a410b

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