Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b51231778a70e4…

MALICIOUS

PDF

32.9 KB Created: 2021-06-28 17:29:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 116fdf5adef9cd4bdfc447346c9b4836 SHA-1: 0e1a002d1709eab8db7cb8ce910a2e10f6b39589 SHA-256: d4b51231778a70e480adf468c21d5979c74246b198c7a890e3700a50e2cfe72a
200 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that point to known malicious redirector infrastructure, specifically advertising a "free Roblox Card Code Generator" and "game hack". The document body reinforces this lure with similar text and links. The presence of a visual download button and instructions for a password-protected archive suggest a multi-stage attack designed to bypass security controls and trick the user into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/free-roblox-card-code-generator-game-hack In PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/best-meme-tshirts-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-daily-spins-today_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-speed-hacks-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-app_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-link-app_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/linkmon-free-robux-website_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/script-for-steves-one-piece-roblox-hack_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_off00002a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A97 22384 bytes
SHA-256: ca97096629d87a16aad37b7a541a5dabba90d75f32eadf02318d4d4aae34d7f6
font_01_sfnt_off00005bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BFC 18928 bytes
SHA-256: de161d963928094f798ec72a4e922a7fcc64060118a09e9f0c577e8ce296591d

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