Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bca57bd72ca46a…

MALICIOUS

PDF

43.4 KB Created: 2021-05-12 07:33:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e479a3899cde3d4a7c596830ec796660 SHA-1: d395b0cf5f9f3cbb49f7059254306896e6b342ef SHA-256: 55bca57bd72ca46a9cbb2a2f8022a08b671afe8185664712ae37f09831c5779d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded URLs and a heuristic firing for a security bypass, indicating an attempt to trick the user into disabling security measures. The document body, though garbled, suggests a lure related to free game currency or items. The presence of multiple external URIs and the ML classifier's high confidence score support a malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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/blox-supply-free-robux-game-hack
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/roblox-but_GM431946152.pdf
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/coin-monster_GM406889139.pdf
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/promo-code-free-robux_GM431946152.pdf
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/free-minecraft-java-edition-account_GM479516143.pdf
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/free-spins-coin-master-without-survey_GM406889139.pdf
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/master-coin-free_GM406889139.pdf
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/coin-master-hack-tool-v1-9-pc_GM406889139.pdf
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/how-to-hack-coin-master-root_GM406889139.pdf
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/coin-master-free-coins-and-spins-link_GM406889139.pdf
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/robux-generators-that-actually-work_GM431946152.pdf
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/how-do-you-get-free-robux-without-paying_GM431946152.pdf
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/coin-master-hack-spin-160-pro_GM406889139.pdf
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/minecraft-hacked-client-18_GM479516143.pdf
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/free-roblox-toy-codes_GM431946152.pdf
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/coin-master-free-spins_GM406889139.pdf
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/buy-robux-free_GM431946152.pdf
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/coin-master-game-2021-free-spin-link_GM406889139.pdf
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/coin-master-free-spins-link-2021-march_GM406889139.pdf
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/free-pet-treats-coin-master_GM406889139.pdf
    • http://ppl.man2kediri.net/__statics/gudangsoal/files/coin-master-hack-lost-world-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004abe.bin
b15849e50a712bf9b22fba38604d892147649ff670cda578a4454b7430030e91
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ABE 25864 bytes
font_01_sfnt_off000086b3.bin
0902d75613bc39446e97d9d8a05e59c43b59cebedccbae9a4ab3fb6f34b2e91e
pdf-font-stream PDF embedded font (sfnt) at offset 0x86B3 18444 bytes