Malicious PDF — malware analysis report

Static analysis result for SHA-256 8127c42dddd1245d…

MALICIOUS

PDF

43.2 KB Created: 2021-05-15 02:03:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 430ffbba11531f385d0142f6c693b5b5 SHA-1: a3ff5af914def6e562c2627fe9096a7d5bc65299 SHA-256: 8127c42dddd1245d26759ddb25c1d686ed35a8f7540e399cd068427854ccc604
110 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm designed to attract users searching for game cheats or currency. The document body and extracted URLs indicate a lure related to obtaining free Robux for Roblox or spins for Coin Master. The ML classifier strongly flagged this PDF as malicious, and the presence of a large number of external links supports this finding.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/rbx-roblox-game-hack
    • http://glll.de/images/roblox-free-robux-no-verification_GM431946152.pdf
    • http://glll.de/images/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://glll.de/images/coin-master-free-spins-no-survey_GM406889139.pdf
    • http://glll.de/images/how-to-hack-people-on-roblox_GM431946152.pdf
    • http://glll.de/images/how-to-get-more-robux-for-free_GM431946152.pdf
    • http://glll.de/images/coin-master-mod-version-free-download_GM406889139.pdf
    • http://glll.de/images/coin-master-free-spin-and-trading_GM406889139.pdf
    • http://glll.de/images/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdf
    • http://glll.de/images/roblox-rewards_GM431946152.pdf
    • http://glll.de/images/free-spins-coin-master-hack-2021_GM406889139.pdf
    • http://glll.de/images/free-robux-giveaway-live_GM431946152.pdf
    • http://glll.de/images/gamehunters-coin-master_GM406889139.pdf
    • http://glll.de/images/coin-master-email-rewards_GM406889139.pdf
    • http://glll.de/images/roblox-system_GM431946152.pdf
    • http://glll.de/images/free-spins-coin-master-app_GM406889139.pdf
    • http://glll.de/images/coin-master-game-hack-version-download_GM406889139.pdf
    • http://glll.de/images/coin-master-free-spins-link-today-facebook_GM406889139.pdf
    • http://glll.de/images/coin-master-hack-mobile_GM406889139.pdf
    • http://glll.de/images/will-minecraft-dungeons-be-free_GM479516143.pdf
    • http://glll.de/images/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049b9.bin
1c26582065fcbc824bac1f4aa1bb19f6aa9409bb48906181c8bb8665ded3c685
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49B9 26448 bytes
font_01_sfnt_off00008816.bin
b5f4a847199c5858993cc7b96674f5fc7fdb993d36e54c452d2822089e03f31f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8816 17784 bytes