Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95fd7d2ca27d795…

MALICIOUS

PDF

46.6 KB Created: 2021-06-07 13:31:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 15bd73f48356adcc20a98c034ea72a27 SHA-1: 54cae153ac3d9190836ed6efa1faffdc28b4a76f SHA-256: a95fd7d2ca27d7950067ea574cd6db2499d558d5310c3f1cb29c362b340f4cad
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to direct users to potentially harmful content. The document body, though partially corrupted, contains a URL related to game cheats, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/cheat-in-roblox-jailbreak-money-game-hack
    • https://www.ferraroni.net/public/risorse/ck/files/coin-master-lucky-patcher-hack_GM406889139.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/free-robux-no-scam_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/apps-that-give-you-free-robux_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/tiktok-free-view-iphone-apps_GM835599320.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/coin-master-hack-apk-android_GM406889139.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/free-coin-master-spins-for-today_GM406889139.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/roblox-free-play-no-download_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/coin-master-free-stuff_GM406889139.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/earn-robux-today_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/coin-master-free-spins-app_GM406889139.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/minecraft-windows-10-free-code_GM479516143.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/coin-master-free-in-app-purchases_GM406889139.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/free-coin-master-spins_GM406889139.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/free-game-pack-coin-master_GM406889139.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/minecraft-116-apk-download_GM479516143.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/village-4-coin-master_GM406889139.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/hack-to-protect-village-on-coin-master_GM406889139.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/make-free-robux_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/websites-that-give-you-free-robux_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ded.bin
ee246ee3959121faa06620b42788ace9a25da8f4ffaa6252fd07d8a8800b6f1e
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DED 30016 bytes
font_01_sfnt_off00009180.bin
7c4d91697a9b8dae16d07e53300b243976c917bea416aa48054302fc3cb9755e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9180 19116 bytes