Malicious PDF — malware analysis report

Static analysis result for SHA-256 f244d430c27e6fec…

MALICIOUS

PDF

34.8 KB Created: 2021-07-01 23:40:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b4bcdcac1d0cc08161748a455c79fc44 SHA-1: 26f491ce2009adc49a8442410664108bc19952af SHA-256: f244d430c27e6fec21d7c0732049a47c4a5c954e6a651fb1efb050dd284e9ff3
162 Risk Score

Malware Insights

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

The PDF document contains numerous links and a lure for 'free Robux' and game hacks, directing users to external sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection mechanism. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/free-way-to-get-robux-by-using-inspect-and-edithtml-game-hack PDF link annotation
    • https://imagetravelnepal.com/userfiles/files/how-to-get-free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/free-download-roblox-hack_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/roblox-hack-exploit-project-pokemon_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/hack-jailbreak-roblox-2021-rocketfull_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/free-roblox-website_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/hack-master-coin-pc_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/how-to-hack-hell-on-roblox_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/how-to-make-a-minecraft-java-server-for-free_GM479516143.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
font_00_sfnt_off00002f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F3B 21988 bytes
SHA-256: ec81a5b5b0333221eea4aafaebc3b9f575ad9be337d37e71d7a46c5ff4997ab7
font_01_sfnt_off00005fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDB 20168 bytes
SHA-256: 31688021f0b8d836774fdee061a4c091537cdc06c6a09f589cd45d3d2a9eefc0

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