Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0d49734bdb59d10…

MALICIOUS

PDF

35.0 KB Created: 2021-07-08 08:27:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5ca4448331ec9a9fb03a9d3f672ebeb9 SHA-1: 0eda603a1308bf46fb6bf868793e0653ec0847b5 SHA-256: d0d49734bdb59d10a5c205d6b4101248f0cbcb2501e277c35be4da0f90596682
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on what appears to be a "game hack" or "free spins" generator. These links redirect to malicious infrastructure, specifically `http://netcdn.tw/app/406889139/coin-master-free-stuff-game-hack`. The presence of a visual download button and the ML classifier's high confidence score further support the malicious nature of this document. No scripts were extracted, but the embedded URLs and the lure content are sufficient to determine the attack pattern.

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/406889139/coin-master-free-stuff-game-hack In PDF document text
    • https://www.donjastubica.hr/files/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/oprewards-com-login_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • http://www.donjastubica.hr/files/shirt-ash-on-roblox-free-on-shirt_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/google-how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/how-to-get-free-robux-without-waiting_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://www.donjastubica.hr/files/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-robux-scam_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_off00003629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3629 21932 bytes
SHA-256: 619a6221723f0169133e683aaeaa6168da301c389a42b669fcbb70aaebfa8284
font_01_sfnt_off000066d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D9 18140 bytes
SHA-256: ffbe3bd5e7ca89ebd9867be994f107e79cc056fa0179a9297eb86efc4e13e545

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