Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf0aaf4eae8274a…

MALICIOUS

PDF

39.5 KB Created: 2021-05-22 09:42:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0336ab6b1d27037a2688381291b299af SHA-1: c078d31a57dc594e8b4e371dfce843c1be1a4e4d SHA-256: 4bf0aaf4eae8274afed342c8ef0cc2fc28025b8ac1a0308453d087034ae9833b
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 0.8060

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-gift-card-codes-game-hack PDF link annotation
    • http://bishopdiego.org/images/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bishopdiego.org/images/free-money-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://bishopdiego.org/images/minecraft-free-android_GM479516143.pdfIn PDF document text
    • http://bishopdiego.org/images/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://bishopdiego.org/images/minecraft-hacker-skin_GM479516143.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_off00003162.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3162 25860 bytes
SHA-256: 31bb2a05d0c4a427b6fbc118476fa7207ed7fad140a261ea530f176b7b5953da
font_01_sfnt_off00006ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDF 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off000077a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77A0 18640 bytes
SHA-256: ab9c735b01157041a26a1754a1ceb43d7e93b9bb6de5cba43436a791952d9cfa

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