Malicious PDF — malware analysis report

Static analysis result for SHA-256 08cd186bd37f0de7…

MALICIOUS

PDF

36.9 KB Created: 2021-05-21 17:31:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b2a6472b96477d21ea9c42c4a560c9e4 SHA-1: d91d7cd63b56350aee47804bb5c9dfa2dc9851fd SHA-256: 08cd186bd37f0de7918e2476465e72082aa87b9c182eb123e1690a283f8c1643
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains multiple embedded URLs and a call-to-action to download a file, masquerading as a generator for game items. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document also prompts users to install remote support tools, which is a high-risk activity in unsolicited documents. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 4

  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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/479516143/free-op-minecraft-servers-game-hack
    • http://jbm-constructions.com/images/free-coin-master-cards_GM406889139.pdf
    • http://jbm-constructions.com/images/free-unlimited-robux_GM431946152.pdf
    • http://jbm-constructions.com/images/rewardex-robux_GM431946152.pdf
    • http://jbm-constructions.com/images/pokemon-go-free-yanma_GM1094591345.pdf
    • http://jbm-constructions.com/images/coin-master-spins-and-coins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000352b.bin
ad214e9657fd26ae3944838654f33be9c374f18b836551351c2d6e91e2f19b3a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x352B 25784 bytes
font_01_sfnt_off0000704d.bin
a77b7ff2a68dfc8683e01ffa7febdd478081a7961822aa2eebc6e1611696765c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x704D 17856 bytes

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