Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c37ebd8de383126…

MALICIOUS

PDF

41.9 KB Created: 2021-05-16 09:20:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e863ab12ecda1a3cf8de294744ad264a SHA-1: 6a575d3ea29ae187474363d20eabb39b9031b1b5 SHA-256: 8c37ebd8de38312674a148eccacedb5d9faeedf9acf379b089ebec2fd6a27c3d
160 Risk Score

Malware Insights

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

The PDF contains multiple links to malicious redirectors and lures, specifically targeting users interested in game hacks and free currency. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and a visual download button lure reinforces the malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to exploit user interest and redirect them to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/coin-master-free-online-game-hack In PDF document text
    • http://julo-it.net/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/free-robux-download_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/roblox-executor-free_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://julo-it.net/images/free-100-robux_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004946.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4946 24952 bytes
SHA-256: a07b3e17a5077151e08e16476edabf9f5e0fd12aaa4a263403e211272b974327
font_01_sfnt_off00008304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8304 17784 bytes
SHA-256: 5cb4b072a296e1d0a116510b6a928a0a81b450dccfe828cef627c6c52934b7a2

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