Malicious PDF — malware analysis report

Static analysis result for SHA-256 8659c4ebb3caf227…

MALICIOUS

PDF

36.3 KB Created: 2021-07-04 13:21:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 280345baf3e9784a40da5415f756c66f SHA-1: aaf50e84a8d6306e2ee0c5d802dccd87eb8a3282 SHA-256: 8659c4ebb3caf227ee155056f1c5d34751b0eab041671defb4eadd1cd66609e5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free in-game currency, such as Robux and Coin Master spins. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract traffic. The primary URL http://netcdn.tw/app/431946152/how-to-get-free-robux-without-human-verification-2021-game-hack is a clear lure for a game hack. While no scripts were explicitly extracted, the nature of the links and the 'ML_NYX_PDF_MALICIOUS' flag suggest a high likelihood of leading to scam or potentially malicious content.

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/how-to-get-free-robux-without-human-verification-2021-game-hack PDF link annotation
    • https://malungtreks.com/userfiles/files/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/hacks-para-roblox-phantom-forces-2021_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/minecraft-sign-up-free_GM479516143.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/free-clothing-group-roblox_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/roblox-lumber-tycoon-2-money-hack-2021_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/00-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/minecraft-jar-free_GM479516143.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/free-robux-with-no-verification_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_off00003216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3216 22920 bytes
SHA-256: 2b5072c091f7d685fa601356bdd1502239587e8eccdd70e90fc545a4a5bf4c73
font_01_sfnt_off00006541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6541 20264 bytes
SHA-256: 26aa4917e1153719256d6dd4d07c71b39b84df2f774e0169f128f53eab8dbbb8

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