Malicious PDF — malware analysis report

Static analysis result for SHA-256 71407854b32b1846…

MALICIOUS

PDF

34.1 KB Created: 2021-07-06 00:11:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 64bf5bd73e705735a8f2bf8ebf9c1783 SHA-1: 3114ae2426f993cdb9b68e05267a963ccfd11ed6 SHA-256: 71407854b32b1846762d7fb8cda79b53684a03d0fcec140e505cf37dec448a4b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many of which are hosted on `library.fdk.ac.id` and point to resources related to game cheats and hacks. The primary external URL `http://netcdn.tw/app/406889139/unlimited-coin-master-free-spins-game-hack` suggests a lure for downloading applications. The ML classifier strongly indicated maliciousness, and the overall structure points to a link farm designed to distribute potentially unwanted or malicious software.

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/unlimited-coin-master-free-spins-game-hack PDF link annotation
    • https://library.fdk.ac.id/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/op-rewards-robux_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/how-to-get-hacks-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/roblox-jailbreak-nclip-hack-2021-may_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/how-to-hack-a-2021-roblox-account_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/how-to-get-robux-free-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/cheat-engine-roblox-dbor_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/roblox-download-windows-free_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/roblox-hack-generator-online-no-survey_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/how-to-hack-all-roblox-games_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/hack-robux-free-generator_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-homepage_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/can-you-earn-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/case-clicker-hacked-roblox_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-robux-codes-list_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_002_off00002e88.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E88 22608 bytes
SHA-256: ad51060caa4110f94e750ef7ae5b843a070c1625bad75fd37ff22e1962f740e8
font_01_sfnt_off000060f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F5 18868 bytes
SHA-256: 2614a93aa226769b9bcda9f2b70c854a7220d675dfa99f6f802674302d402f76

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