Malicious PDF — malware analysis report

Static analysis result for SHA-256 12bb691b1eab989e…

MALICIOUS

PDF

44.4 KB Created: 2021-05-21 14:12:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 556b7a8112d9ce466da994cf7fa96e62 SHA-1: 6ba5fc8dd11aa2b71bbb47c0e271b971c92c7dad SHA-256: 12bb691b1eab989e1ef7e2e1e7bc8ad86e7c8be1352640cd30691392d545305c
82 Risk Score

Malware Insights

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

The document presents itself as a lure for 'Cool Free Roblox Outfits' and contains a fake CAPTCHA or human verification prompt, a common social engineering tactic. It also embeds multiple URLs, including one that appears to be a direct link to a malicious PDF, suggesting an attempt to trick the user into downloading further malware or visiting a compromised site. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7947

Heuristics 4

  • 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 https://netcdn.xyz/app/431946152/cool-free-roblox-outfits-game-hack PDF link annotation
    • http://reggieslockandkey.com/images/easy-robux-hack_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux-games_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.micIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003619.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3619 25948 bytes
SHA-256: ecdea7c49f185303f3a004a4cba94ee95a50f2fa445bfe3dd416c4bb2b2e69e7
font_01_sfnt_off0000724e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x724E 4084 bytes
SHA-256: d9cef5bdcb33cc99cba6676832642f2ec904ba05224107371e62c580d53174db
font_02_sfnt_off0000802e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x802E 3396 bytes
SHA-256: e59bc53cd4c0ee65dc1533becad2866f345dcb060e6c68bb8187d21cb9f973ee
font_03_sfnt_off00008c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C20 18312 bytes
SHA-256: 417c7b24102dcc08af0a4c58268c6a25298d4645c7c37a471affeae5ac7401c6

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