Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b8269a1b9c3675…

MALICIOUS

PDF

43.3 KB Created: 2021-05-11 21:31:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 27fb6d2104a52bd191aa9be760f95130 SHA-1: 41b64ff592925f914ce490352eae4a872b5071c5 SHA-256: a5b8269a1b9c36755fd16bccd24dcee371926e8c339dfbc7e7607a857de9a314
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links and a call-to-action phrase, strongly suggesting a lure for users to click on malicious URLs. The primary URL, https://netcdn.xyz/app/406889139/coin-master-heaven-free-spins-game-hack, and many others hosted on katalog.stikesmukla.ac.id, appear to be part of a link farm designed to redirect users to potentially harmful content, such as game hacks or scams. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/coin-master-heaven-free-spins-game-hack
    • http://katalog.stikesmukla.ac.id/repository/how-to-hack-coins-in-mcpe-master_GM406889139.pdf
    • http://katalog.stikesmukla.ac.id/repository/gaming-dunia-coin-master-free-spins_GM406889139.pdf
    • http://katalog.stikesmukla.ac.id/repository/minecraft-hacked-apk_GM479516143.pdf
    • http://katalog.stikesmukla.ac.id/repository/how-to-get-free-pet-food-on-coin-master_GM406889139.pdf
    • http://katalog.stikesmukla.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • http://katalog.stikesmukla.ac.id/repository/roblox-com-games-referrer-roblox-player_GM431946152.pdf
    • http://katalog.stikesmukla.ac.id/repository/free-spins-coin-master-2021-today_GM406889139.pdf
    • http://katalog.stikesmukla.ac.id/repository/free-robux-scams_GM431946152.pdf
    • http://katalog.stikesmukla.ac.id/repository/free-robux-co_GM431946152.pdf
    • http://katalog.stikesmukla.ac.id/repository/master-coin-free-spin-daily_GM406889139.pdf
    • http://katalog.stikesmukla.ac.id/repository/coin-master-coins-hack_GM406889139.pdf
    • http://katalog.stikesmukla.ac.id/repository/free-coins--spins-coin-master_GM406889139.pdf
    • http://katalog.stikesmukla.ac.id/repository/coin-master-free-spins-youthnow_GM406889139.pdf
    • http://katalog.stikesmukla.ac.id/repository/moon-active_GM406889139.pdf
    • http://katalog.stikesmukla.ac.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • http://katalog.stikesmukla.ac.id/repository/free-coins-and-free-spins-coin-master-2021_GM406889139.pdf
    • http://katalog.stikesmukla.ac.id/repository/daily-spin-coin-master-free_GM406889139.pdf
    • http://katalog.stikesmukla.ac.id/repository/games-like-minecraft-but-free_GM479516143.pdf
    • http://katalog.stikesmukla.ac.id/repository/how-to-create-group-in-coin-master-free-spins_GM406889139.pdf
    • http://katalog.stikesmukla.ac.id/repository/minecraft-hacked-client-18_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004974.bin
1691a51bcfb040c72b33609e555f100d27a7d7d2051e5e5eb5c4107346740e6e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4974 27348 bytes
font_01_sfnt_off0000880a.bin
6cee86ead4aeee921a3b6e14ddf6eb594f4a141ca364aa42231f8e25adb97f4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x880A 18000 bytes

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