Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b37998f51267e1…

MALICIOUS

PDF

34.6 KB Created: 2021-07-09 04:22:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 05535c281ddbfe644d9509642e23fd4b SHA-1: c16c82cb4d78ff23b6c1c7f425d9b537d649b9c7 SHA-256: 01b37998f51267e1ef8dd6ff51f396380952683e5c76e9549cd65c6de015561b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, primarily advertising game hacks and generators for popular games like Roblox and Minecraft. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a link farm designed to attract traffic. The primary lure URL is http://netcdn.tw/app/431946152/roblox-generator-no-verification-game-hack, which likely leads to further malicious content or scams. No scripts were extracted, but the overall structure points to a phishing or scam campaign.

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/roblox-generator-no-verification-game-hack PDF link annotation
    • https://zarco.co.in/uploaded_files/userfiles/files/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/free-spin-coin-master-app-download_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/hacks-para-roblox-tener-robux_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/roblox-breaking-point-aimbot-hack_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/how-can-i-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/free-robux-place_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/roblox-premium-free_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/games-like-roblox-online-free_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/coin-master-hack-spins_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/adopt-me-roblox-getting-hacked_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_off00003170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3170 22084 bytes
SHA-256: 31ed14f37b2a49a10f1c3b1eed624f1c7595bf3075a01b24cb38732d3e8b0852
font_01_sfnt_off00006299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6299 18844 bytes
SHA-256: 36a7b7fd3e2168eaae3a8412eb1f05da482a5bd44e179c94f92618d05f060a40

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