Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3306b93215ec6f…

MALICIOUS

PDF

44.3 KB Created: 2021-05-11 20:15:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 23b9cda909052cf0911e34b36c0bfc6c SHA-1: a0ddbc0a6727a598b639d3102bff0bbde0b0e1ad SHA-256: 8a3306b93215ec6fc8be96fdca97e047c10d88c10d98bfb5d7120fdae6d3f997
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm of SEO-optimized URLs, many of which point to other PDFs, suggesting a tactic to distribute malicious content or drive traffic to scam sites. The presence of a download button lure and a password archive lure further indicates an attempt to trick users into downloading and decrypting potentially harmful files. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/479516143/is-minecraft-education-edition-free-game-hack PDF link annotation
    • http://library.acehresearch.org/repository/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-spin-and-win-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-no-verification_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-new-cards-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-village-cost_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/haktuts-coin-master-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-version-download_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/heroes-online-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spin-and-coins-links-2021_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_003_off00004f9a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F9A 27160 bytes
SHA-256: b6a14f3217beae1c6ce823e748ffb394733febef2c186a9cbb44015a1fda21e4
font_01_sfnt_off00008be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE8 18024 bytes
SHA-256: 860599eb2378c11ce9f069b8b1214934614c40beead093e3b25ec1c42f286d72

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