Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3188f4bf086b525…

MALICIOUS

PDF

47.7 KB Created: 2021-06-04 03:16:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6928ebc358575d4fb0538fdad54003af SHA-1: c831f05f4abe3e058e8d7321ece268f027a2110c SHA-256: c3188f4bf086b5252255a4e0aaf86bd98e620361584f6acb5a77fbaa7708be63
160 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, disguised as a game hack generator. This lure is intended to trick users into downloading potentially harmful content. The ML classifier strongly indicates maliciousness, and the presence of redirector links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/mcpe-master-hack-unlimited-coins-apk-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/aimbot-exe-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/pubg-uc-hack-app_GM1330123889.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-game-hack-link_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_004_off000052e8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E8 25212 bytes
SHA-256: 8a64cd81ab6e5473083fd444f718e78f548dec94ddabb4525d8ca7bf5f0d2498
font_01_sfnt_off00008bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC3 3124 bytes
SHA-256: a0e4a5f378f23ac829e40ef1a0638115ffab18b17acd7561ed9b637601232063
font_02_sfnt_off000096a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96A5 18584 bytes
SHA-256: f1b230a3282965ca413839eb8e142efd64ad4936c14fd8ecd7bf26ec72144289

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