Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39bdf1e0f8f44a7…

MALICIOUS

PDF

46.4 KB Created: 2021-06-11 13:33:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b010668814e3118cd2f80be111a4a5e7 SHA-1: 10fe26ca88f305af1f1f1ec7c36b14af3065ba24 SHA-256: e39bdf1e0f8f44a7c2b0dec69d6ecc852d4d7b0eedca177e6b0c01caec5d7789
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm related to free in-game currency and hacks. The ML classifier strongly indicated maliciousness, and the presence of a call-to-action phrase further supports a deceptive intent. The document's primary function seems to be directing users to potentially malicious or scam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/can-any-codes-give-u-free-robux-game-hack PDF link annotation
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-can-you-get-robux_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-hack-roblox-easy_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/roblox-how-to-get-a-free-vip-server_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-coin-and-spin-app_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/exploit-roblox-free_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/roblox-groups-that-give-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/mcpe-116_GM479516143.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_off00005480.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5480 26092 bytes
SHA-256: 0b995f01adff8af4bcb4ec660d2fb0cf5004da52768a38c4b1e1c5f33b35ba7a
font_01_sfnt_off000090c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90C7 19016 bytes
SHA-256: 9b5cab4da90deb0105f4b3409480a4469e0a149bec4591a45bb1a94aaae73d33

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