Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c846f282d331d12…

MALICIOUS

PDF

34.0 KB Created: 2021-07-04 10:02:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 56d68469c530b78b3012bf4cd2f2f131 SHA-1: 8115a0492f8b36fc64ff267db207ede6d8521be9 SHA-256: 1c846f282d331d1282dc33ca584662d82fe3414a24327c292f6daeea104a7aa3
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9980

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/www-free-robux-com-game-hack PDF link annotation
    • http://artistaone.co/userfiles/files/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/how-to-get-free-20210-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/how-to-get-free-robux-free-workinggg_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/html-for-free-robux_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/how-do-you-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/trigon-hack-roblox_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/coin-master-cards-for-free_GM406889139.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/roblox-accounts-free-2021_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/cheat-roblox-speed-simulator-2-codes_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/apx-roblox-hack_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/minecraft-wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/ultimate-game-365-free-robux_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/aimbot-hack-roblox-rb-world-2_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/hack-coin-master-free-spins_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
font_00_sfnt_off00002fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD1 21472 bytes
SHA-256: 1f5bd36e9e7a46efa92ca9a1f74a2f9437c931eade1c327e2b430f4a0892388b
font_01_sfnt_off00005ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE7 19336 bytes
SHA-256: a173ff8a3a1fb1a8f757a1ab0f7adc35a375ad8a6d6bf5003b7cfea3ec8bf678

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