Malicious PDF — malware analysis report

Static analysis result for SHA-256 f817af7e5946ec86…

MALICIOUS

PDF

48.0 KB Created: 2021-05-13 14:33:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2fb158e41cc3c1975bd6e943e13486a0 SHA-1: a62e4b4d4229a5ec5b95d2556c476229fadc5eea SHA-256: f817af7e5946ec8678b3735fd277e95dbca6bce21f16fa080a8a9076a2971d20
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, many of which point to other PDF files hosted on the 'huananhai.net' domain, suggesting a link farm or SEO abuse tactic. The primary external URI points to 'netcdn.xyz' and is related to 'windows-10-minecraft-hacks'. The presence of a ML classifier flagging the PDF as malicious and the sheer volume of external links indicate a high likelihood of malicious intent, likely to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/479516143/windows-10-minecraft-hacks-game-hack PDF link annotation
    • http://huananhai.net/images/robux-generator_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/robux-free-com_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/how-to-earn-robux-fast_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_off00004bc7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BC7 30252 bytes
SHA-256: 29d269dfe9c10894519f9757659b0c206630a2fc4c4be785937336b804d91434
font_01_sfnt_off00008dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DBB 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off000097ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97CA 18696 bytes
SHA-256: 404a6a828e36ead2d4cd56abe684579086ad140455fa529c5546af7349081cf7

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