Malicious PDF — malware analysis report

Static analysis result for SHA-256 733cc8558864be66…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 11:28:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bacfc137e18fd004a9685c0114f75066 SHA-1: 30c5b17c23433cb697eb816c5465ab877fda4c47 SHA-256: 733cc8558864be66b491882548d5c6ce8cb4619253d93664cd7db8916e83aed3
142 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are presented as 'game hacks' or ways to obtain free in-game currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm designed to drive traffic to potentially malicious or scam-related content. The primary URL http://netcdn.tw/app/406889139/coin-master-hackcom-xyz-game-hack directly advertises a game hack, reinforcing the lure.

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/406889139/coin-master-hackcom-xyz-game-hack PDF link annotation
    • https://www.jjautomation.in/uploaded_files/userfiles/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://www.jjautomation.in/uploaded_files/userfiles/files/roblox-aimbot-hack-v3rmillion-phantom-2021_GM431946152.pdfIn PDF document text
    • https://www.jjautomation.in/uploaded_files/userfiles/files/how-to-get-free-things-that-cost-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.jjautomation.in/uploaded_files/userfiles/files/unpatchable-robux-hack-robuxian-website_GM431946152.pdfIn PDF document text
    • https://www.jjautomation.in/uploaded_files/userfiles/files/how-to-hack-roblox-for-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://www.jjautomation.in/uploaded_files/userfiles/files/coin-master-hack-tool-without-verification_GM406889139.pdfIn PDF document text
    • https://www.jjautomation.in/uploaded_files/userfiles/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://www.jjautomation.in/uploaded_files/userfiles/files/find-roblox-on-computer-hack-in-escape-from-the-demon_GM431946152.pdfIn PDF document text
    • https://www.jjautomation.in/uploaded_files/userfiles/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jjautomation.in/uploaded_files/userfiles/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://www.jjautomation.in/uploaded_files/userfiles/files/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • https://www.jjautomation.in/uploaded_files/userfiles/files/como-hackear-dragon-ball-rage-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.jjautomation.in/uploaded_files/userfiles/files/coin-master-spin-hack-app_GM406889139.pdfIn PDF document text
    • https://www.jjautomation.in/uploaded_files/userfiles/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jjautomation.in/uploaded_files/userfiles/files/free-roblox-accounts-no-pin-2021_GM431946152.pdfIn PDF document text
    • https://www.jjautomation.in/uploaded_files/userfiles/files/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.jjautomation.in/uploaded_files/userfiles/files/hackear-coin-master-sin-verificacion_GM406889139.pdfIn PDF document text
    • https://www.jjautomation.in/uploaded_files/userfiles/files/coin-master-fan_GM406889139.pdfIn PDF document text
    • https://www.jjautomation.in/uploaded_files/userfiles/files/free-robux-pc-2021_GM431946152.pdfIn PDF document text
    • https://www.jjautomation.in/uploaded_files/userfiles/files/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31EF 22976 bytes
SHA-256: 88d7585b7a38790df8e0ebb4287fda2b4a89e28393f6b47d6953fa00deff22a7
font_01_sfnt_off0000654b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x654B 18752 bytes
SHA-256: 06ef631afbecbc1b5b7dcb8b3eb929a8944b6eea579e5c003e5febb126385d8e

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