Malicious PDF — malware analysis report

Static analysis result for SHA-256 437186493a25f21a…

MALICIOUS

PDF

46.7 KB Created: 2021-05-16 15:30:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2e41e44b4727e0f02dc0f5dd109138f2 SHA-1: af176bf785e9fc65d21eba2d34670ca7afc8c017 SHA-256: 437186493a25f21ae2ec25857b38f5c2549c078f3265582c7ba96e60c2806b79
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links pointing to known malicious redirector infrastructure, specifically advertising 'free generators' and 'game hacks'. The primary malicious URL identified is https://netcdn.xyz/app/406889139/coin-master-daily-free-spins-and-coins-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at redirecting users to potentially harmful websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/406889139/coin-master-daily-free-spins-and-coins-game-hack In PDF document text
    • https://www.nema.go.ke/images/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • https://www.nema.go.ke/images/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • https://www.nema.go.ke/images/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/coin-master-free-fire_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/robux-online_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/blogger-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/coin-master-free-gold-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/how-to-get-free-minecoins-in-minecraft_GM479516143.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_003_off00004880.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4880 27548 bytes
SHA-256: c2a12acf60a8b3c5cbf55ef21906982bbacbac1e54d2652f5b90aa85066d562e
font_01_sfnt_off000087e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87E9 3460 bytes
SHA-256: 27f6ee24b80a0c45a340e32027a43d6c3a7853aac96563eed14d58819399f6a8
font_02_sfnt_off00009354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9354 18480 bytes
SHA-256: 323fea871d3154f9ddf991b22fd859b77165b4ee4e2d03de0fe4666202988bbb

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