Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d5983ad5d40154…

MALICIOUS

PDF

45.5 KB Created: 2021-06-09 11:38:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 96d2074de7e3bdd75c7c74938548a962 SHA-1: 16ff8eca9f22af40f240278d10e125344146efdd SHA-256: 08d5983ad5d401540cab12650de777c76348d20eb2d9d57ac64080e09a91cb38
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDFs, forming a link farm. One of the primary links directs to a "free-robux-generator.exe" file, indicating a likely attempt to trick users into downloading malware. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/free-robux-generator.exe-game-hack PDF link annotation
    • http://sv-nahetal.de/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/roblox-com-games-referrer-roblox-player_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/boku-no-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/pubg-uc-with-easypaisa_GM1330123889.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-views-tiktok_GM835599320.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-working-hack_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/roblox-one-piece-millenium-hack-devil-fruit-esp_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-roblox-code-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/hack-roblox-players_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_off00005210.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5210 26232 bytes
SHA-256: c1b6d4236ce5e67f21d2d4278ab46a544b3d392e76ab81931ef223ad86f6f168
font_01_sfnt_off00008f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F00 18412 bytes
SHA-256: e1917bced040593f4cedcd19025cf241cbdc522fe16beaa9842ea4e3146b354e

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