Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6127bfc00c24b52…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 02:42:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 477b085978c3aec887390508d3458470 SHA-1: 40083e5b7d761a300e9867a9d1138a07cd3b7225 SHA-256: d6127bfc00c24b527dbd82ad8cca0488d5b9776c2eeff3a960e3ca03a90b6ce5
160 Risk Score

Malware Insights

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

The PDF contains embedded links that are identified as malicious redirectors, specifically luring users with 'free generator / game hack' content. The document body, though partially corrupted, contains references to 'Coin Master Free Spin' and a URL that aligns with the heuristic findings. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of a malicious workflow, potentially involving the exploitation of PDF vulnerabilities to execute further stages.

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/coin-master-free-spin-ml-game-hack In PDF document text
    • https://www.sonestad.se/library/repository/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-robux_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/roblox-free-iron-man_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/tiktok-free-view-iphone-survey_GM835599320.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/roblox-person_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/hack-avatar_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/roblox-source_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-hack-iosgods_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-get-free-characters-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/minecraft-free-download-iphone_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_off000030ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30AB 23000 bytes
SHA-256: f6953c8599aad5e5f5d52ee5f09993b7926b675c42e29829169262d9f5b2f19d
font_01_sfnt_off0000645c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645C 18248 bytes
SHA-256: c18038b999a15e068e0fcec6b3cb299d21e05aa15a09c32d3b19c8c95a871ee0

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