Malicious PDF — malware analysis report

Static analysis result for SHA-256 176102d0f22272aa…

MALICIOUS

PDF

46.1 KB Created: 2021-06-13 23:24:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a4610f6220f97f8bb6f7d21c8fe18936 SHA-1: 34bf0dbf22c6f362b44978dfcc8784a8fa0cf699 SHA-256: 176102d0f22272aa42290f241e15a8d09b3a9a3b8eb525e9eb35267e166726fe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and game hack lures, indicating a phishing or scam attempt. The document body, though partially corrupted, contains references to 'game hack' and 'free generator', reinforcing the lure. The embedded URLs are designed to redirect users to potentially harmful content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.co/app/431946152/cheat-seconds-thill-death-roblox-game-hack In PDF document text
    • http://yochin.org.tw/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-hack-descargar_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-roblox-card-code-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-real-hack-2021_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/pubg-uc-kr-version_GM1330123889.pdfIn PDF document text
    • http://yochin.org.tw/images/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-get-free-stuff-on-roblox-2021-on-phone_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/tiktok-free-followers_GM835599320.pdfIn PDF document text
    • http://yochin.org.tw/images/free-spin-coin-master-link-today_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_off00004b07.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B07 25716 bytes
SHA-256: 84460dcfbd5faa8604444801a87deebc9ccde4291253f6a238380238dff0ba8a
font_01_sfnt_off0000866a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x866A 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off0000901b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x901B 18744 bytes
SHA-256: 4999af66b82e7a841fece97ed33e335c92b9d8feacfe1a4e650f07710ec4e8c4

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