Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2a896a6333f0a4…

MALICIOUS

PDF

47.4 KB Created: 2021-06-13 18:43:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7951fafa0713c8a364df04ed2fd3a28d SHA-1: 753f8eeac41d1e282ae9f8ebb1b9c20a5a3a4282 SHA-256: cf2a896a6333f0a41ddd8105b1f8cb037b1a804c8ab2d057eb1761c5539b613a
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that are presented as links to game cheats and hacks, indicating a lure to download malicious content. The heuristic PDF_SEO_LINK_FARM firing suggests a large number of these links are present, and the ML_NYX_PDF_MALICIOUS model strongly flagged the file. The presence of a 'download button' heuristic further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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-murder-mystery-cheat-codes-game-hack
    • http://unifieo.br/images/hacks-and-cheats-for-coin-master_GM406889139.pdf
    • http://unifieo.br/images/get-free-cards-in-coin-master_GM406889139.pdf
    • http://unifieo.br/images/blox-supply-free-robux_GM431946152.pdf
    • http://unifieo.br/images/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdf
    • http://unifieo.br/images/coin-master-hack-without-verification-2021_GM406889139.pdf
    • http://unifieo.br/images/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdf
    • http://unifieo.br/images/tiktok-free-edits_GM835599320.pdf
    • http://unifieo.br/images/minecraft-ps4-free_GM479516143.pdf
    • http://unifieo.br/images/coin-master-free-400-spin-link_GM406889139.pdf
    • http://unifieo.br/images/rbxoffers-earn-free-robux_GM431946152.pdf
    • http://unifieo.br/images/cool-outfits-on-roblox-for-free_GM431946152.pdf
    • http://unifieo.br/images/free-robux-just-click_GM431946152.pdf
    • http://unifieo.br/images/hack-the-coin-master-game_GM406889139.pdf
    • http://unifieo.br/images/coin-master-free-spins-fb-champion_GM406889139.pdf
    • http://unifieo.br/images/hacks-to-get-free-robux_GM431946152.pdf
    • http://unifieo.br/images/how-do-i-get-free-robux_GM431946152.pdf
    • http://unifieo.br/images/what-is-a-robux_GM431946152.pdf
    • http://unifieo.br/images/lazyblox-com-free-robux_GM431946152.pdf
    • http://unifieo.br/images/get-free-robux-without-doing-anything_GM431946152.pdf
    • http://unifieo.br/images/coin-master-free-spin-today_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d87.bin
dfcd4355115603796afafca0ccac9009915cc0b82ba63d20352a74ccbbc74fcc
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D87 25160 bytes
font_01_sfnt_off00008804.bin
63a179d8a9645bea05c6d53b1776faf4e4a7281930de6cf484e639846bec2e20
pdf-font-stream PDF embedded font (sfnt) at offset 0x8804 3656 bytes
font_02_sfnt_off000094be.bin
ba89815d869e6deade96329b17ff333c019ef5d19e1079b62ccb13d8c6be3ba6
pdf-font-stream PDF embedded font (sfnt) at offset 0x94BE 18972 bytes