Malicious PDF — malware analysis report

Static analysis result for SHA-256 58376aeafcd43b1d…

MALICIOUS

PDF

35.2 KB Created: 2021-07-06 06:55:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b3fcc63bf18e77c7411432cac528e4b4 SHA-1: eaf5c79e16804bd5085b05f2bcb03f50fc325dd7 SHA-256: 58376aeafcd43b1d55a083d89c94f2167dcecd10129adc7a59804d6b921dbfcd
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to 'free Robux' and directs users to an external URL, which in turn hosts a large number of other PDF files. This indicates a likely SEO link farm or a scam designed to drive traffic to malicious or deceptive content. The ML classifier also strongly flagged this PDF as malicious.

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/431946152/hacks-to-get-free-robux-game-hack
    • https://library.institutpendidikan.ac.id/repository/free-2021-robux_GM431946152.pdf
    • https://library.institutpendidikan.ac.id/repository/thebesian-get-roblox-ninja-animation-free_GM431946152.pdf
    • https://library.institutpendidikan.ac.id/repository/free-item-codes-murder-mystery-2-roblox_GM431946152.pdf
    • https://library.institutpendidikan.ac.id/repository/paypal-roblox-hack_GM431946152.pdf
    • https://library.institutpendidikan.ac.id/repository/how-to-get-story-mode-for-free-roblox_GM431946152.pdf
    • https://library.institutpendidikan.ac.id/repository/roblox-hack-codes_GM431946152.pdf
    • https://library.institutpendidikan.ac.id/repository/free-robux-with-no-verification-2021_GM431946152.pdf
    • https://library.institutpendidikan.ac.id/repository/does-roblox-premium-expire_GM431946152.pdf
    • https://library.institutpendidikan.ac.id/repository/coin-master-rewards-free-spins_GM406889139.pdf
    • https://library.institutpendidikan.ac.id/repository/coin-master-free-spin-no-offers_GM406889139.pdf
    • https://library.institutpendidikan.ac.id/repository/roblox-booga-booga-hack-download-free_GM431946152.pdf
    • https://library.institutpendidikan.ac.id/repository/minecraft-net-free_GM479516143.pdf
    • https://library.institutpendidikan.ac.id/repository/coin-master-free-gift-link-2021_GM406889139.pdf
    • https://library.institutpendidikan.ac.id/repository/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdf
    • https://library.institutpendidikan.ac.id/repository/how-to-get-minecraft-for-free_GM479516143.pdf
    • https://library.institutpendidikan.ac.id/repository/coin-master-free-food-for-pet_GM406889139.pdf
    • https://library.institutpendidikan.ac.id/repository/free-coin-master-spins-for-today_GM406889139.pdf
    • https://library.institutpendidikan.ac.id/repository/comment-hacker-sur-roblox-admin_GM431946152.pdf
    • https://library.institutpendidikan.ac.id/repository/seven-v2-roblox-free-download_GM431946152.pdf
    • https://library.institutpendidikan.ac.id/repository/free-promo-codes-for-roblox-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003372.bin
ec4839318a0e0e60f055e5401d0412e687c416c4eb29d44b63f797e736393a36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3372 22240 bytes
font_01_sfnt_off000064d5.bin
a46b776bb67c7b468de6bb210db8cc3c07a9aad6d9a2155761eaac94cf23c7ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D5 18992 bytes

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