Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f528259ee8b2af…

MALICIOUS

PDF

45.1 KB Created: 2021-05-11 02:30:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 82f723ee173b91c23556bb463c26c16c SHA-1: 221659c16124a8fdcb614346364d4ee639377eb9 SHA-256: a4f528259ee8b2afbe9c18ebf5e20ffd93b9f13dea2c526164029258747884d6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising "free generator / game hack" lures for popular games. The primary redirector URL is https://netcdn.xyz/app/406889139/coin-master-claim-free-spins-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to trick users into clicking malicious links, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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-claim-free-spins-game-hack In PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/daily-spin_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-robux-pins_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-change-your-roblox-username-for-free_GM431946152.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_off00004b1d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B1D 24956 bytes
SHA-256: 5ce9080aac1ec162109658acb531376e79db3eed7faeeac1f10a6cd35e4a7049
font_01_sfnt_off00008499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8499 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E4B 18220 bytes
SHA-256: 4508a7247666ecd7f475af3e2510e2d7297b60fda6d209b486c2dc6be28a63e8

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