Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c8cbf33bc3ed7c…

MALICIOUS

PDF

35.5 KB Created: 2021-05-23 12:04:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7b259546c30656fc60bc23b4321b4a44 SHA-1: a9c895ee8d7fe3365b9a812fac6a6856499f3502 SHA-256: 09c8cbf33bc3ed7c85fe9cda626648b2d0a7a1f784d888372dc82c549707a75c
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure for a fake CAPTCHA or human verification prompt, directing users to a URL associated with 'free generator / game hack' services. This suggests an attempt to trick users into downloading or executing further malicious content. While no scripts were directly extracted, the PDF structure and embedded links indicate a social engineering tactic to facilitate initial compromise.

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/835599320/free-tiktok-followers-no-survey-game-hack PDF link annotation
    • https://www.tw-storage.com.tw/upload/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-roblox-injector_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/hack-coin-master-apk-download_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_002_off00003287.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3287 24224 bytes
SHA-256: 4359a4d98608ef380c6dadd9d1ec05f602c5e4d31af82efd8d5c2b804ad319bf
font_01_sfnt_off00006a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A00 18128 bytes
SHA-256: 4d5ae90dc7158db100f8a60f18795856627c30e44bb6186b706c2f28ceb56c30

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