Malicious PDF — malware analysis report

Static analysis result for SHA-256 2815f312d3dad974…

MALICIOUS

PDF

35.5 KB Created: 2021-05-20 16:37:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b03b45fc0826543242689557f91483e4 SHA-1: 8858444ace558891eb103a2b513f800b25f9ef32 SHA-256: 2815f312d3dad97455f298d240a4f26e8a9cb97aca0bd1fb6263744cb351bade
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/roblox-premium-free-game-hack PDF link annotation
    • http://www.elleventi.it/images/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.elleventi.it/images/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://www.elleventi.it/images/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.elleventi.it/images/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://www.elleventi.it/images/how-to-hack-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_off00002f22.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F22 24872 bytes
SHA-256: 70035279e5093a28c479da8044b0e6f5df2b0899bd3fdc259007f0bd7fe01eae
font_01_sfnt_off0000689a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x689A 18620 bytes
SHA-256: 29b072d58d5b3a55b665a3fffae90f40690866f16f9b518bc51084b043f759b6

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