Malicious PDF — malware analysis report

Static analysis result for SHA-256 38541746f4ee2aaa…

MALICIOUS

PDF

43.3 KB Created: 2021-05-11 01:32:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9404e9974c51b6d16ecd3c04e869ac91 SHA-1: 1d1c4ffdde3e0542a160e7e6846e4e432e29fb2b SHA-256: 38541746f4ee2aaa2a7d81ae4589da6d11da53cfe7fcdb664a54a3f000d1467b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting "game hacks" and "free spins". The heuristic firings indicate the PDF is designed to lure users to these malicious redirectors. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification suggest a malicious intent to redirect users to potentially harmful content or further stages of attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/daily-spin-game-hack In PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/hack-a-game_GM431946152.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/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/fbchampion-com_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-robux-pins_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-hack-apk-download-2021_GM406889139.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/cheat-codes-for-coin-master_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-coin-and-spin-link_GM406889139.pdfIn 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-spins-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_003_off00004781.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4781 24120 bytes
SHA-256: 1cc770fbf3ce9a731de8be26fe3872465c6fe9192ca4a5c55462d4009d571a73
font_01_sfnt_off00007dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DDA 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000087c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87C5 17896 bytes
SHA-256: f5c28686dcaa6e4f5af5eb824d4c2910815e14a2156f8517a627a86c98a11a8a

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