Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b71ebe9c7ccae9…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 14:24:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2d7b1543fb8f6cf3409aab40121265f2 SHA-1: 26a33ccfb0e1d72f0ba8aa4da288d70ee63538b6 SHA-256: 21b71ebe9c7ccae980b55e61a6a3dd48b462c6d1f2c01a5b6c6ac853ddfd9354
200 Risk Score

Malware Insights

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

This PDF document employs a lure for game hacks and cheats, directing users to malicious redirector infrastructure. The presence of a password archive lure suggests an attempt to bypass security controls by encrypting a payload. The ML classifier also flagged this document as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/free-diamonds-coin-master-game-hack In PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coinmaster-links_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-roblox-shirts-templates_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-do-you-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-executor-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-spins-link-facebook-page_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_off00005253.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5253 25456 bytes
SHA-256: 0360ba3678aac8ad339aca3d27ea44eace8c00220c04e86af4eea65f9658f658
font_01_sfnt_off00008c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C3F 18312 bytes
SHA-256: 023a9ba599e82108ef095f60474bccbb9207093afb07317a246e7535a81f1180

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