Malicious PDF — malware analysis report

Static analysis result for SHA-256 305478557b737a84…

MALICIOUS

PDF

45.4 KB Created: 2021-05-14 22:27:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c497ceb2ad753121a406980588747e2f SHA-1: 6d66f03fefde868e7c3b22f18b973a6436628fe8 SHA-256: 305478557b737a8457a757f4c437340679ef2c1c54aeac8179b0b70cd6180efe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting "game hacks" and "free generators". The document body and heuristics indicate a lure designed to trick users into clicking these links, likely leading to further malicious content or downloads. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs strongly suggest a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/clean-master-hack-coins-game-hack In PDF document text
    • https://foc.vn/public/upload/files/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-cheat-codes_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-free-generator_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/hack-coin-master-app_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-hack-app-android_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-free-spins-and-chips_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_off00004a4b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A4B 26120 bytes
SHA-256: d3c55f5cfa3daa48d9a9cad2a802d3492b3fd9ce85b87be3aa6bfb4b4b7e9753
font_01_sfnt_off00008515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8515 3228 bytes
SHA-256: fb56570b78cc67ed6f160bccedde752e62bb12dd9edeae5515ee501d32942e96
font_02_sfnt_off00009056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9056 17788 bytes
SHA-256: 25d6d0476a1dec79520b462677dbeace48df554864f90b72e23f6455cf4131f4