Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58d758badc3da8f…

MALICIOUS

PDF

44.0 KB Created: 2021-06-04 01:50:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 52fb3241ea9e2b8d1b68b94e45599dcc SHA-1: c91a36cd046a9830ff1b0e63ac352c26cfbd5e3a SHA-256: c58d758badc3da8f453387715c435b110dc5d80ada24c4202d4029432c2889c3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The document body and embedded links strongly suggest a phishing or scam attempt to trick users into visiting a malicious site. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious redirection, likely leading to further malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/free-spin-coin-master-game-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spin-27_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-bedrock-hacks-windows-10_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/avatar-the-last-airbender-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-daily-1-ga_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-mod-menu_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-2021_GM406889139.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
stream_004_off00005107.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5107 24888 bytes
SHA-256: 05e7732d13a7b5155273f1e9b721a4753325da11eb76f1a31428db11b98e96da
font_01_sfnt_off00008a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0E 18148 bytes
SHA-256: 05f474a5dd778b1a8f82bb3f3194e0f6909204339d3dcef5442e6da61b36e890

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