Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b643c7cb7201f5…

MALICIOUS

PDF

41.3 KB Created: 2021-04-29 13:17:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d889d1748aea8ecf3ee636da18d7452d SHA-1: 6d266306bcb53bcff7fd29b9c092a466fe51d485 SHA-256: a3b643c7cb7201f5bacba4a9f07592ffeda3dd08f408bfb6084513d98bbc9fd9
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document uses a lure related to game hacks to entice users to click on a link. It also contains instructions to disable security software, which is a high-risk indicator. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the malicious URL embedded in the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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
  • 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/como-activar-hacks-en-roblox-game-hack PDF link annotation
    • https://lib.stie-yai.ac.id/repository/free-roblox-character-codes.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-robot-animation-pack-free.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-apocalypse-rising-hack-download.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/hacking-on-mano-county-roblox.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/we-hack-robux.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-command-cheats.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-get-free-codes-for-roblox.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/hack-free-robux-2021.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-roblox-followers-generator-2021.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/kuso-ico-roblox-free-robux.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000421a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x421A 25800 bytes
SHA-256: 55cb8e20ee7f4aeb7c0756981aa0a7f4ec044bc601125a82333f9609087372c8
font_01_sfnt_off00007e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E62 18780 bytes
SHA-256: b6b56b3747b6ab1284e25db75be0c43d62a33953803b988ec6da8402f85d0e3b

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