Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb9378989d7356b…

MALICIOUS

PDF

46.4 KB Created: 2021-05-13 20:32:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1069627409f6ef8ebf7b35bc306a4cd8 SHA-1: bec990166a1aa9a2acea6d8250c5d8930c923a01 SHA-256: 3cb9378989d7356b4c861ab0482bb5bf1842a88103d8f5c8e3fe06c5342d24c3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are related to game cheats and hacks, suggesting a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm heuristic further supports this. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a likely attempt to redirect users to malicious content, potentially for credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/406889139/cm-daily-spins-game-hack
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdf
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/free-fire-coin-master_GM406889139.pdf
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/coin-master-hack-apk-android-1_GM406889139.pdf
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/how-to-get-free-robux-on-computer_GM431946152.pdf
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/free-robux-hack-no-verification_GM431946152.pdf
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/daily-free-spins-coin-master_GM406889139.pdf
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/free-robux-without-human-verification-real_GM431946152.pdf
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/free-coins-on-coin-master-without-verification_GM406889139.pdf
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/robux-generator-no-survey_GM431946152.pdf
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/free-spin-link-coin-master_GM406889139.pdf
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/coin-master-free-box_GM406889139.pdf
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/coin-master-20-free-spins-link-2021_GM406889139.pdf
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/robux-hack-generator_GM431946152.pdf
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/free-robux-hacker-us_GM431946152.pdf
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/free-robux-no-verification-needed_GM431946152.pdf
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/roblox-com-games-referrer-roblox-player_GM431946152.pdf
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/how-to-get-robux-on-roblox_GM431946152.pdf
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/coin-master-hack-pc-free_GM406889139.pdf
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/coin-master-claim-spins_GM406889139.pdf
    • http://xn----7sbabhw4a8b0addm1c.xn--p1ai/images/how-to-hack-coin-master-android_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004dfc.bin
0b011afacb7694dba01ac769aa30e89caf661dc684a0dc5cdfe5b34cf5dbe062		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DFC 25744 bytes
font_01_sfnt_off000088d4.bin
3219ea0e52318e94ce20b7b3342b9bbf5f3a389bd6fb88bf591e9537762def99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88D4 18160 bytes
font_02_sfnt_off0000aa44.bin
e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA44 3264 bytes

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