Malicious PDF — malware analysis report

Static analysis result for SHA-256 7685686f19196aa0…

MALICIOUS

PDF

37.2 KB Created: 2021-05-21 17:02:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ce9809539f3fff9242adb260d771ce21 SHA-1: 07d552b2f3f59d13665055faba8152052df53cf6 SHA-256: 7685686f19196aa0294de980bb656aaa053eeb80f78d3591a97ed6caaf780ddd
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 0.9447

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-roblox-toy-codes-2021-game-hack PDF link annotation
    • https://www.shin.ge/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.shin.ge/images/roblox-g_GM431946152.pdfIn PDF document text
    • https://www.shin.ge/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.shin.ge/images/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://www.shin.ge/images/minecraft-free-download-mobile_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_off00003242.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3242 26872 bytes
SHA-256: e3c13d9633ff54065b45ed7fb2a48807260726d69559b6dcf063485e6b2fa69b
font_01_sfnt_off00006ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC7 18704 bytes
SHA-256: 310b0eb167ed5acb3e0393954d8d7f46b13cc3d4732db83d1204f458420b6348

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