Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee6e35170c93cf2…

MALICIOUS

PDF

41.6 KB Created: 2021-05-17 03:33:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 066b614e3d6331ff9131d4a0bc15e71b SHA-1: 414f225cb9530b3de6852316534469dc942db485 SHA-256: 3ee6e35170c93cf2ca40423a815c1faf0fa913a0f847489d9a774e827cf97b56
220 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and a link farm, indicating a strong intent to redirect users to potentially harmful sites. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' specifically points to a lure involving game hacks and generators, which is a common tactic for malware distribution or phishing. While no scripts were extracted, the presence of numerous malicious links and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.xyz/app/431946152/rewards-roblox-com-game-hack In PDF document text
    • http://kontaktadig.se/images/strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/avatar-the-last-airbender-roblox_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/claim-roblox_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/hack-my-game-xyz-coin-master_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/www-robux-com_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-free-spin-reward-links_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/free-daily-spins-from-coin-master_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_003_off000048a6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48A6 23884 bytes
SHA-256: e08cb074a2ffd45bf8b6160e9f7caabf50d17fd17a735bdd6c90f97ed419e67e
font_01_sfnt_off00007ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF3 18612 bytes
SHA-256: 0805bffa22b3b32285c837745a7f5bf7eb2f6e06bb316935304eba25a67b2756

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