Malicious PDF — malware analysis report

Static analysis result for SHA-256 551eeb1a5c22f922…

MALICIOUS

PDF

43.6 KB Created: 2021-05-14 07:24:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0bc70897f54d5a94d4ac494c2a675002 SHA-1: e747558c733db65c59b4d53ba519b41ffd08048d SHA-256: 551eeb1a5c22f92235a432869ea286aa70f27c35ca2740cbb933c67ab4aec469
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on gts.edu.gh and appear to be part of a link farm designed to attract users searching for game cheats and hacks. The ML classifier strongly indicated maliciousness, and the presence of a download button lure further supports a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and linked content suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/431946152/1x1x1x1-roblox-id-game-hack PDF link annotation
    • http://gts.edu.gh/library/repository/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/real-robux-generator_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/pig-master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-generator_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-hack-apk-online_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-do-you-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-2021_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_off00004ab8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AB8 27208 bytes
SHA-256: b8e8a50946aa44c4078d36c640cdc88c47b7b0d6488e820edea37dd9a29643c6
font_01_sfnt_off000088bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88BF 18064 bytes
SHA-256: dea6029c024e5d62f8b9af3bc6dd5a72a2a62928dc573dca849bdc3d11534152

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