Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b964c7cbdebf2f…

MALICIOUS

PDF

35.3 KB Created: 2021-07-04 18:46:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: edc36a22df47400dc3e3a2ca66592be9 SHA-1: 2fea636500b4ae1d9198616bcf5f33cf5a6c529b SHA-256: 58b964c7cbdebf2f11279ca50d63521954b309f7490e69898679ab4bbdc89de1
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting 'game hacks' and 'free spins' to lure users. The primary malicious URL identified is http://netcdn.tw/app/406889139/coin-master-free-spin-realme-products-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at driving users to potentially malicious websites, likely for credential harvesting or further malware delivery.

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-realme-products-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/leah-ashe-trying-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-skirt-free-to-take_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-no-survey-no-offers_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-games-free-play-online_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/download-hack-coin-master_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_off000031ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31ED 22936 bytes
SHA-256: 406bc44c9da8dca967f7c334807259a4729488827ca528ebfa8194249161957c
font_01_sfnt_off00006599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6599 18976 bytes
SHA-256: 9a063faea9114050ab3b1da930e9c077db51df0f0eeb33b8a77db856b87907e7

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