Malicious PDF — malware analysis report

Static analysis result for SHA-256 4102c794603bb0d6…

MALICIOUS

PDF

36.0 KB Created: 2021-07-05 03:25:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2a5061cf6b8c7295d8732e69917a18c0 SHA-1: 1d1bf550c3934a79b48154576ccb51350bf71020 SHA-256: 4102c794603bb0d63135cbed5181b4cea914176b4de2ba026611f10372d0edf7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains multiple links to a known malicious redirector, specifically advertising a 'Coin Master Hack Version 2021 Download'. The document body and heuristics indicate a lure to download a game hack, which is a common social engineering tactic to deliver malware. The ML classifier also strongly flagged this PDF as malicious.

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-hack-version-2021-download-game-hack In PDF document text
    • https://www.sonestad.se/library/repository/minecraft-packs-free_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-games-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/universal-minecraft-converter-free_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-get-java-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/hacking-is-bad-roblox-id_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/paytm-to-pubg-uc_GM1330123889.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/is-pubg-uc-worth-it_GM1330123889.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/welcome-to-roblox-hack_GM431946152.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_off000033b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33B3 23048 bytes
SHA-256: 95b372f4cc22c7cf66ef1256810bd3ece05f48ccdef3737d58ff2e2eda953a5a
font_01_sfnt_off00006764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6764 19120 bytes
SHA-256: 57291a1557c3b3cfaf2211bc97aa7d4df3f086592edbbb7333689b1754ce491f

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