Malicious PDF — malware analysis report

Static analysis result for SHA-256 e800645b9b1a3767…

MALICIOUS

PDF

42.2 KB Created: 2021-05-13 00:01:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c5acc8c6c68a5e3e98401be058f74c15 SHA-1: 9b41dad442d630d6766c727070c4496f5141a63f SHA-256: e800645b9b1a376755c494e36c973a3db88b6f926649c2613ca818430a35ed13
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that mimics a generator for in-game currency, strongly suggesting a phishing or scam lure. The presence of a 'Password-protected archive handoff' heuristic indicates that the document may be designed to trick users into providing passwords or downloading password-protected archives, a common tactic to bypass security controls. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/431946152/free-robux-codes-generator-no-verification-game-hack
    • http://ambingenieria.com/images/is-roblox-free-on-nintendo-switch_GM431946152.pdf
    • http://ambingenieria.com/images/how-to-get-free-robux-without-human-verification_GM431946152.pdf
    • http://ambingenieria.com/images/how-to-get-free-admin-in-roblox_GM431946152.pdf
    • http://ambingenieria.com/images/buxblast-com-robux_GM431946152.pdf
    • http://ambingenieria.com/images/roblox36com-free-robux_GM431946152.pdf
    • http://ambingenieria.com/images/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdf
    • http://ambingenieria.com/images/robux-free-co_GM431946152.pdf
    • http://ambingenieria.com/images/get-free-spins-on-coin-master_GM406889139.pdf
    • http://ambingenieria.com/images/free-robux-codes-2021_GM431946152.pdf
    • http://ambingenieria.com/images/best-free-minecraft-hacked-client_GM479516143.pdf
    • http://ambingenieria.com/images/flip-master-coins-hack_GM406889139.pdf
    • http://ambingenieria.com/images/coin-master-daily-spin-free_GM406889139.pdf
    • http://ambingenieria.com/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdf
    • http://ambingenieria.com/images/minecraft-pe-hack-client_GM479516143.pdf
    • http://ambingenieria.com/images/roblox-free-robux-hack_GM431946152.pdf
    • http://ambingenieria.com/images/how-to-actually-get-free-robux_GM431946152.pdf
    • http://ambingenieria.com/images/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdf
    • http://ambingenieria.com/images/how-to-get-free-roebucks_GM431946152.pdf
    • http://ambingenieria.com/images/claim-free-spins-coin-master_GM406889139.pdf
    • http://ambingenieria.com/images/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000496f.bin
c5c1ca683cce83cd4eed7cb9ebedd8a099ed862ba0f233f6d214b8c735f478e8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x496F 24364 bytes
font_01_sfnt_off0000811e.bin
a4a7f46a8ec4e4fe0089faa119d4be48f59112184e2c655defb35f5102acccee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x811E 18776 bytes

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