Malicious PDF — malware analysis report

Static analysis result for SHA-256 37133b0868bbaae7…

MALICIOUS

PDF

43.8 KB Created: 2021-05-13 21:17:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 14f7a1b06cd17aa2a80d03f82934dc04 SHA-1: b642bf9bcf82e2ecdf411223f3e4fccc1fdd8ac7 SHA-256: 37133b0868bbaae7779e986099fa78ec53bda3e0021fc2349e968a1b04bb4d62
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are part of a link farm related to game hacks and free in-game currency. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' lure further supports a malicious intent. The document likely serves as a lure to drive traffic to malicious sites or initiate further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/how-to-get-free-robux-promo-codes-game-hack
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/how-do-i-earn-robux_GM431946152.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-spin-link-for-coin-master-game_GM406889139.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/robux-in_GM431946152.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/master-free-spin-and-coin-links-html-m-1_GM406889139.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/minecraft-hacks-pc_GM479516143.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/roblox-free-robux-no-verification_GM431946152.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-robux-no-verification-at-all_GM431946152.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/roblox-lovenet_GM431946152.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/bloxpage-free-robux_GM431946152.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/coin-master-free-daily-spins-link-2021_GM406889139.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/sites-to-get-free-robux_GM431946152.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/coin-master-hack-without-human-verification-2021_GM406889139.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/how-to-get-free-roblox-hair_GM431946152.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-spins-for-coin-master-hack_GM406889139.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-blogspot_GM406889139.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/minecraft-hack-client-18-9_GM479516143.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/freerubux_GM431946152.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/apps-for-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b3d.bin
172d80f2e9289af2dc08b6d6d647ef70ba817f4a820637fcc2cc0e36db95099a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B3D 25784 bytes
font_01_sfnt_off0000871e.bin
5ac59f2bbd716fa5a12c7062aef47b6358464a1e75e3d61e5fb3ce0da7ae841b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x871E 18872 bytes

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