Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9c8486c13b186b…

MALICIOUS

PDF

36.4 KB Created: 2021-07-06 06:11:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e88984c25494f17a02c596a84be7698c SHA-1: ff07d4892b89082ac3595b7c2960e22a5b813b97 SHA-256: 0b9c8486c13b186b8189b51e2b8943fd0bee83be075ce035f5c972770de77b05
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a known malicious infrastructure, specifically promoting a 'Coin Master' game hack. The heuristic firings indicate that the PDF is designed to lure users to a malicious redirector. While no scripts were explicitly extracted, the nature of the embedded links and the lure suggest an attempt to download or redirect the user to a malicious payload, likely involving JavaScript execution.

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-2021-free-spins-link-game-hack In PDF document text
    • https://mountainholidaytreks.com/userfiles/files/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/minecraft-hacked-client-bedrock_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-apocalypse-rising-hack-dll_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/master-game_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-free-followers_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/hackear-juego-coin-master-espaol_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_002_off00003480.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3480 23648 bytes
SHA-256: e33104057b61a398a7fdc75d8497d0b6bbd9e9b1d04d1b0d0e289e7ee2d8a0c2
font_01_sfnt_off00006a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1B 18748 bytes
SHA-256: e86d1d7b2a315a4589de0526ea833c85a652b2f2cf198d952b17ceb10db4042d

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