Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c8ae8f9bc6f6dc…

MALICIOUS

PDF

46.3 KB Created: 2021-05-13 12:08:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: afec96e3dedaf2d12334787046f46519 SHA-1: 6d16f4d7ec0b933be792decb6ae89b07d4a5e292 SHA-256: 51c8ae8f9bc6f6dc6291c43ba97ea5d0a832f033ebda36ca9434bcf37424eb77
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, disguised as free game hacks and generators. The primary lure URL is https://netcdn.xyz/app/479516143/best-free-minecraft-texture-packs-game-hack. While no scripts were extracted, the PDF structure and embedded links strongly suggest an attempt to redirect the user to a malicious site, likely for further exploitation or phishing. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8696

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/479516143/best-free-minecraft-texture-packs-game-hack In PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/coin-master-apk-hack-mod-download_GM406889139.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/robux-generator_GM431946152.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/free-spin-link-in-coin-master-game_GM406889139.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/download-hacked-games-com-coin-master_GM406889139.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/https-rbx-place-rewards_GM431946152.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/minecraft-free-download_GM479516143.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/free-roblox-adopt-me-pets_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_off00004d89.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D89 25792 bytes
SHA-256: f20596cefde83e9e3a04ab0153c572313bd53b07a7b8d48a9da3b0f0f1192134
font_01_sfnt_off00008883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8883 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00009235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9235 18460 bytes
SHA-256: 31257519935a968b1de16a3a71cb9b2eaae2afa87081bbe73112141ce1027594