Malicious PDF — malware analysis report

Static analysis result for SHA-256 88154812b8d2eae1…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 21:21:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0f2bce19459e9e4c37a35d958cf0fb43 SHA-1: 5d47b00282b6d514c1bb7f0a7fc02d98563d4ee8 SHA-256: 88154812b8d2eae19966bc5c649784d0e272ebcda5daea89ad75b164e3a5eab8
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs and a specific external URI pointing to game hack download sites, indicating a lure for users to download potentially malicious software. The heuristic findings confirm the presence of a link farm and a call-to-action button, reinforcing the deceptive nature of the document. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/406889139/coin-master-hack-xyz-download-free-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id//repository/mcpe-116_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-download-pc_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-today_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/mcpe-master-unlimited-coins-free-download_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-spins-2021-app_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-master-coin-pc_GM406889139.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_off00004ffc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FFC 25084 bytes
SHA-256: 41a74b4cd70938f31db488801e4495bbe554593b1de9fa07f46d4421d8756c30
font_01_sfnt_off00008981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8981 18952 bytes
SHA-256: 779e1b2868c6fd3267453bb754d4fa6de943de141d85dc4b922527d53be01414

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