Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b350ecee2f00cf0…

MALICIOUS

PDF

46.1 KB Created: 2021-06-08 23:50:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ee41587fe0b1d2ffee789e9c6bceae5a SHA-1: 2ad2fa9258defd76567018f78511fbb035ab269d SHA-256: 9b350ecee2f00cf0574fe7af931e824bded2fa7cddfa5df914857f269172651c
240 Risk Score

Malware Insights

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

The PDF document contains links to a known malicious redirector infrastructure, disguised as game hacks or generators. The document also instructs the user to copy/paste content into a shell, suggesting an attempt to trick the user into executing commands. The presence of multiple embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.tw/app/431946152/hacks-for-roblox-case-clicker-game-hack In PDF document text
    • http://kontaktadig.se/images/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://kontaktadig.se/images/roblox-free-play-demo_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/get-robux-now_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/rewards-roblox-com_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
stream_004_off00004ec6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EC6 28856 bytes
SHA-256: 4059a2a577c4c6d3d6a3013eae04d0d85406d384bf4a1b10c35168f091eb1c1f
font_01_sfnt_off00009120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9120 18468 bytes
SHA-256: bc08e011c44351a4efb629147cf82a15250493f797d34aaa11558f37074469ef

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