Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e661b3bca735cb…

MALICIOUS

PDF

47.4 KB Created: 2021-06-03 07:20:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1f344f3e2dbee61c99de60b25ed29c86 SHA-1: 40bef368addfb7a0d1e0894973468400c58b5f3e SHA-256: d4e661b3bca735cb55ff01c344d5ffe77bba27e7c5ea4191fea0f3023a12be3f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically advertising 'free generators' or 'game hacks' for popular games. The primary redirector URL is https://netcdn.online/app/431946152/1x1x1x1-roblox-id-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering lure to drive-by downloads or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/431946152/1x1x1x1-roblox-id-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-fan_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-top_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-and-spin_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/robux-match_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-script-executor-free_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/static-moonactive-net_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f79.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F79 25448 bytes
SHA-256: a50b618c978f40c77088fa20594012d56f619e91017ed3889ae38b2b2ee76c00
font_01_sfnt_off00008a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A70 3884 bytes
SHA-256: 64ea6bfd232c3abde76d8b86727203bfa3f935a5783cd0c1f642cf6d3fb42b29
font_02_sfnt_off00009717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9717 18064 bytes
SHA-256: fcc782250b32a9268103ec42f49eec08dcef4213ce8be3623bebdf8f86e5033c

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