Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b821cb47c307686…

MALICIOUS

PDF

47.4 KB Created: 2021-06-13 20:17:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0e4e1598df9a6aa3cc439fe9a1d20a88 SHA-1: 2d9a44422ed999fd74c226797357f6340586e4c7 SHA-256: 8b821cb47c3076862a35b894b1db824dff489976f8d0aa0650bb41b10145c2ed
182 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious intent, including a fake CAPTCHA prompt and instructions to disable security software, which are tactics to bypass user defenses. The document also contains a large number of external links, many of which are SEO-themed and point to potentially malicious content or phishing sites. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lead the user to malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 6

  • 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.
  • 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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 http://netcdn.co/app/431946152/how-to-fly-hack-in-roblox-jailbreak-game-hack PDF link annotation
    • http://feuerwehr-rheinau.de/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-70-spin-link-2021_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/how-to-hack-coin-master-with-game-guardian_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-robux-com_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-free-spins-iphone_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-roblox-gift-card-20219_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/install-free-game-coin-master_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-roblox_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-free-coins_GM406889139.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_003_off00004b4a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B4A 27144 bytes
SHA-256: f01cdb9447df54fa9cdab3580eacc66defde8fa21e5199146c04285e3e536823
font_01_sfnt_off00008ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD3 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off000094e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94E3 18976 bytes
SHA-256: f23038ebefd6fecb303db528d3c9e3436bac0626e57960d9b135425d7864259c

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