Malicious PDF — malware analysis report

Static analysis result for SHA-256 4012c7491943f210…

MALICIOUS

PDF

35.4 KB Created: 2021-07-07 16:03:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c8cba81184b2effb4af6fdd74237115d SHA-1: 36491e83c87ae5540a36014c8f4f40586f59faca SHA-256: 4012c7491943f210537393ecd369880c01474a74d70a8f4ce00ecc54753444f2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirector infrastructure, specifically advertising 'game hacks' and 'free generators' for popular games. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-free-cards-link-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a social engineering attack designed to lead users to potentially malicious websites, likely for further malware delivery or credential harvesting.

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-cards-link-game-hack In PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/roblox-strucid-free-private-server-join_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/daily-spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/murder-mystery-2-roblox-cheats-free-elite-and-radio_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/wurst-client_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/robux-only_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/how-can-i-play-minecraft-for-free_GM479516143.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_off000032c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32C8 23296 bytes
SHA-256: 9a95572cb51ed5f4f91eb45eea07a97409fff6f61ceb0c6f7b8f20f792d2337b
font_01_sfnt_off0000677e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x677E 18340 bytes
SHA-256: b8fa6a9dfd7b898beef7efa7d7509ded23f04ca787285e81f7d871fc825f65d4

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