Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c28fb5d0706efb…

MALICIOUS

PDF

40.5 KB Created: 2021-05-21 13:36:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e99b52309b7c4d55a8c17bc88d76fcc9 SHA-1: 60e7898589a81fccc6fa3b2d5d45a4a2feb38a0a SHA-256: 21c28fb5d0706efba709708ed0639f9dd09ec2bfa00c30ab3a6f360b6ac816dc
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites that promise free game hacks and generators, such as 'robux-free-c-game-hack'. This lure is often used to trick users into downloading malware. The document body and embedded artifacts suggest a malicious intent to redirect users to potentially harmful content, likely for the purpose of downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/robux-free-c-game-hack PDF link annotation
    • https://belixconstructions.com.au/images/coin-master-pc-hack-download_GM406889139.pdfIn PDF document text
    • https://belixconstructions.com.au/images/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://belixconstructions.com.au/images/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • https://belixconstructions.com.au/images/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • https://belixconstructions.com.au/images/rbxcity-free-robux_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_002_off00003231.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3231 32796 bytes
SHA-256: d32b594ca872b3f2ba5db85f1e2fe02595f84dd86a3a14da0cc30dbb1f94c937
font_01_sfnt_off00007e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E18 18012 bytes
SHA-256: 3f1ded8a9c51e4f0f41c660fd84d3573ebe8f92a83837bcaa523a9614d650e73

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