Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a383cac4903e26…

MALICIOUS

PDF

43.4 KB Created: 2021-05-17 11:07:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e3409b68377cf84e382478f71a49bd44 SHA-1: 4f2312300d6c174b921f1594a1ed83318b9c9ea7 SHA-256: b1a383cac4903e26e324deebdf3b62f6a36c94d6775bbb79af4cd7015c4ad5ce
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 0.9969

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/easy-way-to-get-free-robux-game-hack PDF link annotation
    • http://dygmotors.com.py/images/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • http://dygmotors.com.py/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://dygmotors.com.py/images/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://dygmotors.com.py/images/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://dygmotors.com.py/images/simplysarc_GM479516143.pdfIn PDF document text
    • http://dygmotors.com.py/images/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • http://dygmotors.com.py/images/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://dygmotors.com.py/images/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • http://dygmotors.com.py/images/coin-master-hackcom-xyz_GM406889139.pdfIn PDF document text
    • http://dygmotors.com.py/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://dygmotors.com.py/images/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • http://dygmotors.com.py/images/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://dygmotors.com.py/images/withdraw-robux_GM431946152.pdfIn PDF document text
    • http://dygmotors.com.py/images/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://dygmotors.com.py/images/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://dygmotors.com.py/images/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • http://dygmotors.com.py/images/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://dygmotors.com.py/images/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • http://dygmotors.com.py/images/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://dygmotors.com.py/images/coin-master-app-hacks_GM406889139.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_003_off000044e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x44E0 28488 bytes
SHA-256: a7d9b0cbbaf28a02f1ff4dac21d69c9a2a3173816b1a9aac7e2db08dc97a2b0a
font_01_sfnt_off000085ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85AB 18724 bytes
SHA-256: ff2b5f5648817baecf5754646eae61914eefadf3856a555e8e6cbc13d6b08405

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