Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1114269ec9c2ad…

MALICIOUS

PDF

34.6 KB Created: 2021-07-07 21:12:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d8d603c8daeebbb3e11c4179e32c496c SHA-1: 09ccf67eb78bb9271d62c0d61d2a3c483371424c SHA-256: 0b1114269ec9c2ad0e27dc25a559f8dd07ddbd4988e4556669632c28df71bdf4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links, including one to 'netcdn.tw' which is flagged as a redirector for game hacks. The document body and heuristics indicate a lure for 'free Robux' or game cheats, aiming to direct users to malicious websites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a scam or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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 http://netcdn.tw/app/431946152/blox-supply-free-robux-game-hack PDF link annotation
    • https://smark.com.tw/image/data/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-robux-on-xbox-one-for-free_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-spin-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/ldshadowlady-roblox-someone-hacked-my-acount_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-obby-with-out-liking-it_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/can-cheat-engine-get-you-banned-from-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/html-free-robux-30_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-rs-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-hack-roblox-pc-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-mod-version-free-download-34-4_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-60-spins_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/tiktok-free-folowers-75_GM835599320.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-app_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/does-roblox-hack-your-computer_GM431946152.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
font_00_sfnt_off00002e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E9E 22752 bytes
SHA-256: 19b737c2c213cca9487455211de8f6814da19a4a729dfb140d9181272f5f3d7d
font_01_sfnt_off000061ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61BA 19144 bytes
SHA-256: c941b9cd330ffca6848f3389b5cbc1876b0a4e3bd2ae57faafcb8fbf1ae02fb5

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