Malicious PDF — malware analysis report

Static analysis result for SHA-256 e565c74fbbf6105b…

MALICIOUS

PDF

36.1 KB Created: 2021-07-05 14:39:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3e3d4cbef78ff4142526049af0969045 SHA-1: 9e1e5fa0eb875722b5f07430e38cdfe27e62f347 SHA-256: e565c74fbbf6105b849df1ed32a200e4f396458e6448dd3512ad7f907466af5e
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack lure, linking to known malicious redirector infrastructure. The document body explicitly mentions "How To Get Robux For Free 2021" and includes the malicious URL. This indicates a social engineering attempt to trick users into visiting a site that likely hosts malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/how-to-get-robux-for-free-2021-game-hack In PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-roblox-aim-bot_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/pubg-mobile-uc-2021_GM1330123889.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-to-get-free-quirks-in-boku-no-roblox_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-spins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/roblox-free-skin_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/video-de-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-to-change-money-in-roblox-using-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/mcpe-optifine_GM479516143.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/ninja-run-roblox-free_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/roblox-high-school-2-money-hack_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-robux-no-survey-no-download-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000033e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33E7 22672 bytes
SHA-256: f16f06d3841205a7b7d9e439b0b068f85ab788b576fc9571b732e767dba12b33
font_01_sfnt_off000066df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66DF 19384 bytes
SHA-256: de28a66561f48ef455a7e74c3d38ef737581a70ecb9f32033b07134a01356d69

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