Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ffc7647bab7ccb…

MALICIOUS

PDF

33.8 KB Created: 2021-07-04 01:45:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3e791bc2afc1f5a306e1d1b84913d96a SHA-1: 84d55672228355ac8aaf718efa46e75623aa59ff SHA-256: b8ffc7647bab7ccbd90033c01a1a293e7dbf1e52a6e9fb8be766c83b6bd5f5e3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure, designed to lure users into downloading potentially unwanted or malicious content related to game hacks and currency. The document body and embedded URLs strongly suggest a phishing or scam attempt, likely leading to further malware download or credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/431946152/free-robux-group-game-hack In PDF document text
    • http://ebook.itn.ac.id/repository/free-roblox-shirt-template-download_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/roblox-whatever-floats-your-boat-money-hack-site-v3rmillionnet_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/hacks-tools-roblox_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/haktuts-coin-master-free-daily-spins_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
font_00_sfnt_off00002f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F92 21736 bytes
SHA-256: 949516da481dc1c1869efb999fdc899e9b772630a2d75cb67f572f95a595879b
font_01_sfnt_off00005f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F92 18892 bytes
SHA-256: 67507f51078b9d360364fd80bede771b0831b8cadce387b59c9348d966d9fcb5

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