Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb6ff6c227be90f…

MALICIOUS

PDF

44.2 KB Created: 2021-06-11 12:26:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1c468995e686485d8cd770d74f597b2c SHA-1: 1bb96f64a1a8bf12e5692130f002068cb5aaa02c SHA-256: dbb6ff6c227be90f6cc7d787520e167fd9e3b272831552cd114325a9470d5992
102 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and point to content related to free Robux or Coin Master spins. The ML classifier strongly flagged this PDF as malicious, and the presence of a "download button" heuristic suggests a deceptive workflow. The primary intent appears to be driving traffic to these external sites, potentially for ad revenue, phishing, or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/how-to-get-free-robux-on-roblox-studio-game-hack
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/roblox-free-templates-blank_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/roblox-com-free-play_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-spins-from-coin-master_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-shirt-roblox_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-no-human-verify_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/roblox-avatar-com_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/download-hacked-games-com-coin-master_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-with-no-survey_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/mcpe-master-hack-unlimited-coins-download_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/minecraft-java-edition-free-download_GM479516143.pdf
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-official-fan-page_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/fb-coin-master-hack_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-pokemon-brick-bronze-beta-roblox-wiki_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-unlimited-spin-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050cd.bin
ae36fd890bdc09d41e1bdff7f1e343d74fe5412892289ae4f0cf692347cb93fa		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50CD 24540 bytes
font_01_sfnt_off0000890a.bin
14b9694399b8428d923397c1305b8fe99f5bbaaabbbd55de0f3a171b9d392034		 pdf-font-stream PDF embedded font (sfnt) at offset 0x890A 18652 bytes

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