Malicious PDF — malware analysis report

Static analysis result for SHA-256 731521e4395c73ba…

MALICIOUS

PDF

38.5 KB Created: 2021-05-21 15:57:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5c704fa91ba9baea5a83ed4ac031d184 SHA-1: 705129493a86a075d59976136b4ed1c6df2c3270 SHA-256: 731521e4395c73baba1190e04f2c71914ba87a98a63dc0d0e02151df1db97630
122 Risk Score

Malware Insights

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

The PDF document contains multiple links to external websites that promise free game currency or hacks, presented with a fake CAPTCHA lure. The document body and heuristics indicate a social engineering attempt to trick the user into clicking these malicious links, likely leading to further malware downloads or phishing. No scripts were extracted, but the presence of embedded URIs and the fake CAPTCHA heuristic strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-no-verification-required-game-hack PDF link annotation
    • http://bit-sky.com/images/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000030e1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30E1 24404 bytes
SHA-256: 1c68fe515c3e74840d12ee606659de809140895107ffbe800c1dec1074e36c3f
font_01_sfnt_off000068f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68F7 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off000072a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72A5 18944 bytes
SHA-256: 3e075e77f873d88a985ea69ac7fafb934745d76ebabdb09bc56e33f005972947

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