Malicious PDF — malware analysis report

Static analysis result for SHA-256 008fbff75bf7df5b…

MALICIOUS

PDF

45.0 KB Created: 2021-05-16 03:42:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 762360d4b06a32ba4cbad71fc36368e8 SHA-1: 94daa3bffaa0e9042fa08fb7212c9c58358932df SHA-256: 008fbff75bf7df5b42b80094fee889f494edb9cdfd6a5ff2579dd78041880c25
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified as a PDF link farm, suggesting a tactic to drive traffic to various websites. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URIs and the link farm heuristic indicate a malicious intent to redirect users, likely for SEO spam or to facilitate the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.xyz/app/406889139/how-many-levels-in-coin-master-game-hack PDF link annotation
    • http://acp-institut.fr/images/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • http://acp-institut.fr/images/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/minecraft-free-download-linux_GM479516143.pdfIn PDF document text
    • http://acp-institut.fr/images/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/free-links-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://acp-institut.fr/images/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/online-hacking-tricks-coin-master_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/free-robux-glitch_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/how-to-hack-coin-master-apkmody_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/robux-free-online_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004acd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ACD 25436 bytes
SHA-256: defc3babb66616bc1bbaf9261098e849d7e989ebfc71bed42062aa5ddf9c3780
font_01_sfnt_off00008422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8422 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off00008dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC4 18076 bytes
SHA-256: 99893503d576b54c6a7779c175b2bfa9d44389b8fa70f32573e8e1493170e333

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