Malicious PDF — malware analysis report

Static analysis result for SHA-256 97572ebf6d1193a7…

MALICIOUS

PDF

41.4 KB Created: 2021-05-15 09:12:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 68c06e5d5b9c22121f8aac63e3c12518 SHA-1: 483b196259acadb6fe40bf5023c2729fab48f278 SHA-256: 97572ebf6d1193a7b9df29330facb7d2fca9bfee53560d0b35e12d75130ad070
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that are flagged as malicious redirectors, specifically promoting 'game hacks' and 'free currency'. The primary malicious URL identified is https://netcdn.xyz/app/406889139/coin-master-hack-mod-apk-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering lure designed to redirect users to potentially harmful content or initiate further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-hack-mod-apk-game-hack In PDF document text
    • https://www.knjigebuducnosti.com/files/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-come_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/completed-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-hack-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-gift-link_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-block-someone-on-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_003_off000047d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47D7 24428 bytes
SHA-256: 9efc1af8576f2f7e48bbe3188348cc931a23f7c895b4519150f432196fc9b85f
font_01_sfnt_off00007fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC4 18068 bytes
SHA-256: 8758dd50bc7648d35d2c531368c06e2fb0219f77b8251a32ffca1508c8a7ec2c

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