Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16eb14a9bf03298…

MALICIOUS

PDF

41.8 KB Created: 2021-05-16 19:59:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d0ad740e9e66813fc2ff3699dd66950c SHA-1: 055578418407f542a9ebc3f4d11dba21a1519be7 SHA-256: a16eb14a9bf03298f17d1f44b5ed2a0e1ccc29df796710f3fdf196ad88130685
102 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF gateways for game-related cheats and hacks. The ML classifier strongly indicates maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document. The primary intent appears to be directing users to potentially malicious sites for game exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/www-coin-master-hack-tk-game-hack PDF link annotation
    • http://advancedaudiosystems.org/images/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/coin-master-hack-unlimited-spins-game-download_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/free-spins-and-coins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/roblox-g_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/coin-master-free-spin-sites_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/roblox-scam_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
stream_003_off0000487b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x487B 24676 bytes
SHA-256: 1d92f21b544cb960aac2494b100f58a863303c2661e5884640579628336b92cd
font_01_sfnt_off00008178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8178 18080 bytes
SHA-256: 921193ab8241b15930f5390558d31b790c2cfead33e0a160f86367d1d668b4b0

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