Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e9f727d2c1a2d1…

MALICIOUS

PDF

49.3 KB Created: 2021-06-03 22:45:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f66278b92da99b0835a15e2c6466d187 SHA-1: 97f79790f886ea8d8f440ce5b22246d382bbbfe4 SHA-256: a6e9f727d2c1a2d1e0a74a77ff31cff27caf2489b9f444350d150dbbe95de6d2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a deceptive lure for 'Free Robux' and includes numerous external links, many pointing to PDF files with similar themes. The presence of a 'PDF_SEO_LINK_FARM' heuristic and embedded URLs suggests an attempt to drive traffic to potentially malicious sites. Although no scripts were directly extracted, the overall structure and heuristics indicate a phishing or scam attempt, likely using embedded JavaScript to facilitate redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/431946152/free-robux-2021-game-hack
    • http://lib.smklabor.sch.id/repository/coin-master-free-spin-and-coins-links-home_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/rbx-website_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/show-me-how-to-get-free-robux_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/fb-coin-master-free-spins-link_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/promo-codes-to-get-free-robux_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/free-robux-giveaway-live_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/coin-master-tiradas-gratis-link_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdf
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-link-march-2021_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/roblox-free-robux_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/free-2021-robux_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-youtube_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/coin-master-attack-block-hack_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/free-minecraft-mods-for-pc_GM479516143.pdf
    • http://lib.smklabor.sch.id/repository/moonactive-free-spins-link_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/free-robux-safe_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/2021-coin-master-hack_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/minecraft-packs-free_GM479516143.pdf
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-easy_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053f9.bin
4c5367f311ad696004f2a27a3beee5e0a8d4eeaf28b58e8cc10ea089bce8a3c1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53F9 24552 bytes
font_01_sfnt_off00008c11.bin
f462303657ce1de10d3e7d5ae1fe17c8584116bd5bc216971166de87266da924		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C11 7272 bytes
font_02_sfnt_off00009d82.bin
a2c808792aaeb1607b9c3a91ae122c662faffffe8d42f3cf4118be6ccc5b3e7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D82 18416 bytes

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