Malicious PDF — malware analysis report

Static analysis result for SHA-256 acca48387a00dd12…

MALICIOUS

PDF

34.9 KB Created: 2021-07-02 00:25:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 55a21e73bf4ef992cc02843176c0a52c SHA-1: 13a90a30e92fb189af551d1da72b285c9d635359 SHA-256: acca48387a00dd12b5d113811da80642deb874c12ee5d5a41d362dc806d0d996
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and a document body referencing game hacks and cheats, strongly suggesting a lure for users to download malicious content. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO manipulation or to host further malicious content. The ML_NYX_PDF_MALICIOUS score of 0.998 further supports the malicious classification.

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/hack-para-shinobi-life-roblox-2021-game-hack PDF link annotation
    • https://www.tiancom.com.tw/upload/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/roblox-hack-dark-devs-one-piece_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-speed-hack-in-swordburst-2-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/roblox-how-to-get-for-free_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-noob-clothes-roblox_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/roblox-cheat-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/robux-hack-for-free-easy-no-dowland_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/pokemon-go-free-or-james_GM1094591345.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/roblox-tower-battles-hack-script-2021_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-time-hack-ios_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/como-conseguir-robux-gratis-sin-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/roblox-robux-hack-no-download-no-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/keisyo-free-robux_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
font_00_sfnt_off000030ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30CE 22348 bytes
SHA-256: 3f34d391bbb255ffc15da05948d815a049db5d769cc04fef93a64a86a087045a
font_01_sfnt_off000061ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61EA 19500 bytes
SHA-256: 024710aa01351f2004a19e92f00af45ac8c778d74563a6b8e1a018b0af0c1a73