Malicious PDF — malware analysis report

Static analysis result for SHA-256 10801d741d51215d…

MALICIOUS

PDF

35.1 KB Created: 2021-07-07 23:02:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 770340ff86ddaaa77aed7b76ab8b85c4 SHA-1: 65a3b6bd330a8c38a99662104b3a7d1bbe021463 SHA-256: 10801d741d51215d430d7813a39729bfbc1087ef3682810fda04e904a5cb0455
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'hacks' for popular games. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-hack-spins-and-coins-unlimited-free-download-game-hack. This indicates a phishing or malware distribution attempt disguised as a game cheat. No scripts were extracted, but the embedded URLs and heuristic firings strongly suggest a malicious intent to redirect users to harmful content.

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-spins-and-coins-unlimited-free-download-game-hack In PDF document text
    • http://perpustakaan.idia.ac.id/repository/hack-roblox-on-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/roblox-free-body_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/aplicaciones-de-hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/unlimited-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/robux-only_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/roblox-money-cheats-no-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-gernerator_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/real-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/pubg-uc-add_GM1330123889.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-free-spins-youthnow_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_off0000303e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x303E 22760 bytes
SHA-256: d0f87c1a1c5e2a735b5cb358e7d2ee4ba807b8e9d63ba503b54de0f6b47c3364
font_01_sfnt_off00006346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6346 19368 bytes
SHA-256: add0edf7dd0394884c443ca24fd48469f9919274a259a3af7eac1d2f3d12793d

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