Malicious PDF — malware analysis report

Static analysis result for SHA-256 153d0a30df2a93ad…

MALICIOUS

PDF

35.6 KB Created: 2021-05-24 06:59:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 97a519d0bd21278dbc6e8e6480854540 SHA-1: c4de82efacf397f9c7062621c0d42cdecd4aaf01 SHA-256: 153d0a30df2a93adfc3db3fd74e5afbb2c67436d0cdbbc19d273ced683a899b3
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 0.9492

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-100-robux-game-hack PDF link annotation
    • http://behsanroshd.com/images/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://behsanroshd.com/images/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://behsanroshd.com/images/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://behsanroshd.com/images/free-spins-for-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://behsanroshd.com/images/minecraft-font-free_GM479516143.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_off00002ff3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FF3 25876 bytes
SHA-256: 9331e0ade062ec28c32ecda14d25ca2410aa4a31b6a5920c274cc02274c49d6e
font_01_sfnt_off000069a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69A3 18292 bytes
SHA-256: ade71c57547996cc2793a44f7be3e933a3a5664d4c8f362da863e6c031d51f12

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