Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea0f5789705eeaa7…

MALICIOUS

PDF

47.5 KB Created: 2021-06-10 17:20:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 98a8c8409ea0dd5fd38344e05dddd939 SHA-1: 987f53a53a95be4aa69f17633243a3073bc0b87f SHA-256: ea0f5789705eeaa72ae587fe711ad8322657eb61c2c13d7bbcebfe4e43f5da01
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9832

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.
  • 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 https://netcdn.tw/app/431946152/free-robux-no-human-verification-2021-trackid-sp-006-game-hack PDF link annotation
    • https://www.smartitbg.com/images/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://www.smartitbg.com/images/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • https://www.smartitbg.com/images/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://www.smartitbg.com/images/coin-master-hack-online-android_GM406889139.pdfIn PDF document text
    • https://www.smartitbg.com/images/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.smartitbg.com/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://www.smartitbg.com/images/krnl-download_GM431946152.pdfIn PDF document text
    • https://www.smartitbg.com/images/how-to-get-verified-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://www.smartitbg.com/images/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.smartitbg.com/images/minecraft-free-android_GM479516143.pdfIn PDF document text
    • https://www.smartitbg.com/images/free-coin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://www.smartitbg.com/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.smartitbg.com/images/free-minecraft-skins-java_GM479516143.pdfIn PDF document text
    • https://www.smartitbg.com/images/how-to-get-a-free-face-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.smartitbg.com/images/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.smartitbg.com/images/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.smartitbg.com/images/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • https://www.smartitbg.com/images/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.smartitbg.com/images/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • https://www.smartitbg.com/images/how-to-get-free-robux-easy-2021_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_004_off0000550f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x550F 26760 bytes
SHA-256: 14e2e44b180a97bbcc9f99cdfcbf25d02330997bee23874660d4be8314e8df95
font_01_sfnt_off0000921f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x921F 19984 bytes
SHA-256: df1c60906164bfa68c5a3a6532510d99a2034ea5482265e0d441427170850ed8

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