Malicious PDF — malware analysis report

Static analysis result for SHA-256 28cd040e063df82d…

MALICIOUS

PDF

47.7 KB Created: 2021-06-09 02:28:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e2d47001f8fc42481a6bec12b90a41dc SHA-1: 8ff697c45609f8365d54d0f2203cd140123c4f95 SHA-256: 28cd040e063df82d39474f971f505565f6c7a882f036570dc5b0be236cead2c7
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF links related to game hacks and free currency. The document body and extracted URLs suggest a lure for obtaining in-game currency like 'Robux', which is a common tactic for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/how-to-hack-peoples-roblox-accounts-2021-game-hack
    • http://e-library.akbid-purworejo.ac.id//repository/give-me-robux_GM431946152.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/how-to-get-free-cards-for-coin-master_GM406889139.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/free-coin-master-spins-blog_GM406889139.pdf
    • http://e-library.akbid-purworejo.ac.id/repository/how-do-you-get-robux_GM431946152.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/pokemon-go-free-in-app-purchases_GM1094591345.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/free-coins-and-spins-for-coin-master_GM406889139.pdf
    • http://e-library.akbid-purworejo.ac.id/repository/coin-master-32-hack-apk-download_GM406889139.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/rbxfree-com-free-robux_GM431946152.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/coin-master-free-coins_GM406889139.pdf
    • http://e-library.akbid-purworejo.ac.id/repository/how-to-get-free-skins-on-coin-master_GM406889139.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/pokemon-go-free-spoofer_GM1094591345.pdf
    • http://e-library.akbid-purworejo.ac.id/repository/free-minecraft-domain_GM479516143.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/roblox-free-robux-no-human-verification_GM431946152.pdf
    • http://e-library.akbid-purworejo.ac.id/repository/coin-master-hacking-news_GM406889139.pdf
    • http://e-library.akbid-purworejo.ac.id/repository/robuxlove-net-free-robux_GM431946152.pdf
    • http://e-library.akbid-purworejo.ac.id/repository/coin-master-spin-hack-link_GM406889139.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • https://www.semrush.com/prices/
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053e0.bin
ef6f3b882d93f7f6efd3b3d53d20279df4897a8db5d22e0f2859795495086fdf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53E0 28024 bytes
font_01_sfnt_off000094d7.bin
56d87af4ce61dd289e4e73b451e13a370e7386d8d226fabd383f6fc2099b275d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94D7 19324 bytes

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