Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14d5f21b5442081…

MALICIOUS

PDF

35.6 KB Created: 2021-06-22 10:46:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cbdfd142490f865940ac332950616264 SHA-1: af70cce264080b0d4a513efea48fe54d95692a2c SHA-256: b14d5f21b54420816e306bf93079eaf331f4bbe3a721ec73c3ef39050ea896c4
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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-get-free-rocket-fuel-in-roblox-jailbreak-game-hack PDF link annotation
    • https://www.croydex.com/uploads/files/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/hack-coin-master-online_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-open-inventory-hack_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-cheat-engine-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/html-free-robux-30-pastebin-com_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/is-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-bc-roblox-accounts-pastebin_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-hacks-no-surveys_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-booga-booga-hack-script_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-roblox-credit-for-free_GM431946152.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_002_off000033f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33F4 22196 bytes
SHA-256: bf5fea699cddec5fb7c2bd38b74fb345ddc94242275261e9d0852c8b15a260bc
font_01_sfnt_off000064eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64EB 19516 bytes
SHA-256: bb34ff8cbb3247a6d820652910814c6b5a1f792167a6176d3d2f01407286818b

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