Malicious PDF — malware analysis report

Static analysis result for SHA-256 82461c537fd9c162…

MALICIOUS

PDF

47.6 KB Created: 2021-06-03 15:53:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 95778b9ae9a74c84e0e21cd6ae312736 SHA-1: c790a5f97171780b9f63146c705f9f9ef761e42c SHA-256: 82461c537fd9c1620f2d19ad8ee979cc8b3cd9baa19ee6d9c9c25d9a449a625d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links, including one identified as a malicious redirector, leading to a lure for free game currency. The primary link, 'https://netcdn.online/app/406889139/how-to-get-free-spins-in-coin-master-game-hack', is designed to trick users into clicking through to potentially harmful content. While no scripts were explicitly extracted, the presence of PDF-specific malicious link heuristics and the ML classifier strongly indicate a malicious intent to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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 https://netcdn.online/app/406889139/how-to-get-free-spins-in-coin-master-game-hack In PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-fan-club_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/pubg-uc-olx_GM1330123889.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-minecraft-videos_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/como-hackear-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-font-free_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052e1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E1 25448 bytes
SHA-256: 0e30a7623d987b30dbf1dc37d4cb689fe458781b535cadc81ceba19505a1fc6a
font_01_sfnt_off00008e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E41 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000097f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97F3 18052 bytes
SHA-256: 52b27d49d658c5dd219fe1685a79a71966a386845fdc62a41335e5719e4d5001

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