Malicious PDF — malware analysis report

Static analysis result for SHA-256 b406b4ed722678ed…

MALICIOUS

PDF

43.9 KB Created: 2021-06-07 12:59:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3556558e5ed731c422a6b9cc086073ba SHA-1: 683d55f79fb6991d513447f8ca13a6e69f6a8026 SHA-256: b406b4ed722678eda61be05bc8e4dd6931ebee2320073baf8798db02306ea741
102 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are SEO-optimized and point to game-related cheats and hacks. The ML classifier flagged this PDF as malicious with high confidence. The presence of a "download button" heuristic further suggests a malicious workflow aimed at tricking users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/roblox-hack-data-explorer-blox-no-hero-academia-game-hack PDF link annotation
    • http://linens.kiev.ua/images/free-coin-master-spins-link-download_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/cheaterteam-roblox_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://linens.kiev.ua/images/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://linens.kiev.ua/images/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/minecraft-dungeons-download-free_GM479516143.pdfIn PDF document text
    • http://linens.kiev.ua/images/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-free-spin-link-today-50_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_off00004fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FCB 23888 bytes
SHA-256: 7bdbe5f0a6a470e21135854345e8459de39b3bcdeb245b693940b5bb326c195e
font_01_sfnt_off00008647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8647 19184 bytes
SHA-256: f0a8d1718fbe743d2a6db114e7f56a7874ee7299f970f4ee02336ad20b097d97