Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ceb7645f091aa4f…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 14:10:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 095ccd23c03e94e3732fcdd81f3de127 SHA-1: cafc01e381c3070182275be8056201ef0badfc2f SHA-256: 5ceb7645f091aa4f349e5ef2d192510b7a1bb24d8130de937a13392fae396e13
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'game hack generator' that redirects to malicious infrastructure. The embedded URL and the document body both point to this malicious redirector. The ML classifier also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/how-to-get-free-coins-in-coin-master-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-roblox-account-hacked_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-how-to-sell-a-t-shirt-for-free_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-bedrock-client_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-mad-paintball-2-cheats_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/instagram-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/can-i-download-minecraft-for-free_GM479516143.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_002_off00003170.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3170 23256 bytes
SHA-256: 753bfb2e193c92a10734813452457ce1da89133635f0a5feb29aae690b037356
font_01_sfnt_off000065ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65BA 18164 bytes
SHA-256: 9fab875a536b983537b9433768b1ea3e5c55ad95c87001a66781b974c182b662

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