Malicious PDF — malware analysis report

Static analysis result for SHA-256 551358b0c098f7b9…

MALICIOUS

PDF

35.7 KB Created: 2021-07-05 21:12:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f67f550e21ed1e810da88e494a097d98 SHA-1: 1a1d091cd77c973258c7ea95d72989cff3c8b24e SHA-256: 551358b0c098f7b9600e53573f58980b4bc811f032b205ac8dcee2e2d6854084
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, identified as a link farm, that are designed to lure users into clicking on them. The document body and extracted URLs suggest a scam related to free in-game currency and items for games like Coin Master and Roblox. The ML classifier strongly flagged this PDF as malicious, and the presence of a large number of external links indicates a potential distribution or phishing campaign.

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.tw/app/406889139/coin-master-daily-free-spins-link-today-2021-free-game-hack PDF link annotation
    • http://elib.acls-indonesia.com/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/como-ganar-robux-facil-sin-hack_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/download-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/roblox-thanos-shirt-free_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/cheats-to-say-phone-in-roblox_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/code-to-make-things-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/invincible-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/a-file-with-hacked-games-roblox_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/how-to-get-750-000-robux-for-free_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/pubg-uc-price-in-uae_GM1330123889.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/how-to-hack-in-roblox-prison-life_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_off0000321d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x321D 22992 bytes
SHA-256: ea38c7009e07235b029986ad7b6df84efab7209a3232cbf7c8bf8e7702a65d51
font_01_sfnt_off000065b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B9 19344 bytes
SHA-256: bda18ad7bc028b2989dfdc10c84b9c87c1dbf0242a88a3a6fbf9217f203e509c

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