Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bb56d9e860f72d…

MALICIOUS

PDF

33.8 KB Created: 2021-07-04 07:53:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fd8a2851079617c8d83720f84d78ce69 SHA-1: 0b848b77f2582ab80f7a0ccf801b989d8fbfb81b SHA-256: 55bb56d9e860f72d00ee4eb701a91d8c1a7167d1bbb4cce27eb72fb9d1d3fbd2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that promotes free in-game items and currency for popular games, acting as a lure. The presence of a PDF URI pointing to a suspicious domain and a high ML score indicate malicious intent. The document likely serves as a phishing or scam document, directing users to download or click on malicious links.

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/479516143/free-custom-minecraft-skins-game-hack PDF link annotation
    • http://lib.untad.ac.id//repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-get-stuff-that-cost-coins-free-mpe-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-phantom-forces-uncopylocked-how-to-make-all-guns-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-tiktok-likes-2021_GM835599320.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-hack-free-robux-no-downloading_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/giving-fans-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/2021-free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-buy-for-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/www-roblox-com-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-free-robux-discord_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-weight-lift-sim-3-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-robux-for-free-on-bowser_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/install-roblox-free-for-pc_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-free-robux-unauthorized-paymen_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_off00002f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F04 22344 bytes
SHA-256: 7cde9034a9ccc86117f8ccdaeee8a773d67ad084d701a944f10be25cf5c2ce77
font_01_sfnt_off00006083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6083 18568 bytes
SHA-256: c4c6daf187a62d33816a4be374f7655b111248c6c53bfc224d088d33339ffbdf

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