Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac334e15bd2f9ec…

MALICIOUS

PDF

38.7 KB Created: 2021-07-03 21:59:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 80a281cb455eb507483363ff3e3ebf0e SHA-1: fccb3a259c45b853ed4d634847283a4c70ca1325 SHA-256: 8ac334e15bd2f9ece7593b5d7ee032c67cc861d2cfc00f4aac0cd3a9a0aaa2ad
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising game hacks and generators. The primary lure URL is http://netcdn.tw/app/431946152/how-to-hack-roblox-accounts-passwords-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites, likely for further malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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/431946152/how-to-hack-roblox-accounts-passwords-game-hack In PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/roblox-generator-com_GM431946152.pdfIn PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/hack-master-coin_GM406889139.pdfIn PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/free-robux-obby_GM431946152.pdfIn PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/coin-master-tool-hack_GM406889139.pdfIn PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/play-coin-master-online-free_GM406889139.pdfIn PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://www.kontraktorjogjadiy.com/ckfinder/userfiles/files/free-minecraft-account-and-password_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
font_00_sfnt_off00003e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3E52 22884 bytes
SHA-256: 73e640f9cbee6e5f836c917a145a0f92c13222af31230be7b58d73bdea2df58f
font_01_sfnt_off0000716c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x716C 19392 bytes
SHA-256: 3c84ae6f9a5e0552a856930bec3990e9fbbab980911ed78a7ad20e22a995b826

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