Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac8817e9a6ba853…

MALICIOUS

PDF

33.7 KB Created: 2021-06-25 01:33:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fee1623ce68fec159640d3b2f63bea04 SHA-1: 5f33b12e8f4fd02262535493eaf7019142b10394 SHA-256: bac8817e9a6ba8535968d4330a9c0372cb4fa6a08c5ec825abe717704b3cc7ee
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links to external websites, many of which are hosted on `knj.com.tw` and appear to be part of a link farm designed to attract users searching for game hacks and free in-game currency. The presence of a direct download URL and the ML classifier's high confidence score indicate a malicious intent to deliver unwanted or harmful content. The document body itself contains keywords related to game exploits and download prompts.

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.co/app/431946152/greasyfork-roblox-hacks-game-hack PDF link annotation
    • https://knj.com.tw/image/data/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/pokemon-go-five-free-raid-passes_GM1094591345.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-do-you-make-your-own-roblox-hack_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-admin-tool-roblox_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/roblox-exploit-download_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/roblox-cheat-enigine-cheat-table_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/moon-active_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-hack-music-code-on-roblox_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-coin-hack_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
font_00_sfnt_off00002f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F21 21800 bytes
SHA-256: a8f37f938d8fc406164c3e0be70eb5fb5ab031befe4107add4a9330c6fdae60e
font_01_sfnt_off00005f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2A 18836 bytes
SHA-256: 235d0bedbce61be044a17182f054c07313eefda2fe80978fbc399b954b0a6d0a

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