Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a70d2ec83ee0b79…

MALICIOUS

PDF

41.0 KB Created: 2021-05-15 11:07:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 31708eb74f515a246ed713b3a8276f03 SHA-1: 7ee8674aed27e4a1109c1adf5292def8d59227ab SHA-256: 9a70d2ec83ee0b79b2a1fdea2324bb7e966ff481f93d06294bd75b74f2c0a732
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, disguised as offers for free game currency or hacks. The document body and embedded URLs strongly suggest a phishing or scam attempt, likely intended to lead users to further malicious content or downloads. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/free-coins-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-link_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/robux-hack-me_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/vip-roblox-free_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-link-for-spins_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-java-edition-free-trial_GM479516143.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/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-hack-tool-no-survey_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_off000047cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47CF 24804 bytes
SHA-256: aadfd947c6e6a8049a2c529f6ef7f444b33b80fcca86a183fb86447eb5543ec5
font_01_sfnt_off000080cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80CC 17380 bytes
SHA-256: 4587a0da3d318d3aab2e4d3a2e17e88175961c64bd2fb3ac3dbf4933656e475a

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