Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6943641f245e015…

MALICIOUS

PDF

41.1 KB Created: 2021-05-20 03:20:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 71e139b543dfe9e054a9aab561ebf941 SHA-1: 086965cc29c7cdc4a1da45d747f878ea618c2091 SHA-256: a6943641f245e0151db319d10e946af4d80bbccff582a2071ad85b3e562051bb
160 Risk Score

Malware Insights

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

The PDF contains multiple links to malicious redirectors disguised as 'game hacks' and 'free spins' for popular games like Coin Master. The primary malicious link identified is https://netcdn.xyz/app/406889139/coin-master-event-hack-game-hack, which is flagged by multiple heuristics as a known malicious redirector. The document body, though heavily obfuscated, contains references to this URL and appears to be a lure for users seeking in-game advantages.

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/coin-master-event-hack-game-hack In PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/can-tiktok-free-download_GM835599320.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-hacks-iphone_GM406889139.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/hack-coin-master-spin-apk_GM406889139.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/best-hack-for-coin-master-2021_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_off00004741.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4741 24788 bytes
SHA-256: e7f2126cf28bf4f723d7023be5fcd6590b445f838b14b83ffa7f00e55cc07a23
font_01_sfnt_off00007f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F53 17828 bytes
SHA-256: 3aa3979f7db9db60f85c12743f17b039c262b8ea7d603c2f9581d8dcabd3843c

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