Malicious PDF — malware analysis report

Static analysis result for SHA-256 38411338dcdc2a31…

MALICIOUS

PDF

34.4 KB Created: 2021-06-29 01:49:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f5b9bef8a42cec35ed9ff5655985c9cf SHA-1: 4e3ae69132bc9c3d8c5c8d5fec8f041c46f579c3 SHA-256: 38411338dcdc2a31394f4812ac952fe40ebe68320553c6f5da05e1511832200e
102 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for a link farm and a machine learning model flagged it as malicious. The document body contains text related to 'free Robux' and a download URL, suggesting a lure for potentially unwanted software or malware. The presence of numerous external links points towards an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/bouton-free-robux-game-hack PDF link annotation
    • https://www.yantan.com.tw/upload/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-get-free-robux-on-android-phone_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/counter-roblox-hack-aimbot-2021_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/download-roblox-free-windows-xp_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/http-lazyassgamercom-robloxhackrobuxgenerator_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-hack-a-roblox-account-easy-2021_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-many-levels-are-in-coin-master_GM406889139.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_off00002fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FCB 22596 bytes
SHA-256: 637cc344e906e3670318a91747de6d94abfe489d1f7a46da09bd26d7e10ebb4c
font_01_sfnt_off00006214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6214 18820 bytes
SHA-256: 208420850232bb56f96151ca9821bdb97354f28a7dd88f4c2b4ace4b4b00e784

Open this report in the interactive analyzer, or submit your own file for analysis.