Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28a929154606dbb…

MALICIOUS

PDF

34.6 KB Created: 2021-07-08 23:08:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cbe57c297df543cf76c16d5ec1b6a01d SHA-1: ecd1459cc9a03ea98c3c1f06d07fc946bbe2f0bd SHA-256: c28a929154606dbb4760497c2ee503fd79253019b9735273876a5f941fd9ef62
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, identified as a link farm, that lead to pages offering free items for games like Roblox and Coin Master. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a download button lure suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful websites.

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.tw/app/431946152/all-free-items-in-roblox-game-hack
    • http://perpus.smkn1pemangkat.sch.id//repository/coin-master-2021-free-spins-link_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/get-free-robux-2021_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/minecraft-free-edition_GM479516143.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/roblox-fun-com-free-robux_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/blox-world-free-robux_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/como-hackear-coin-master-en-espaol_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/coin-master-hack-apk-35-11_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/roblox-no-clip-cheat-engine_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/how-to-make-free-vip-servers-on-roblox_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/roblox-april-fools-hack_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/free-robux-pins_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/how-to-hack-to-get-robux_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/coin-master-free-download-for-pc_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/how-do-you-get-roblox-for-free_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/como-hackear-coin-master-ios_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/cheat-engine-money-hack-roblox_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/how-to-get-minecraft-java-for-free_GM479516143.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/free-roblox-printables_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003090.bin
db847958b78e21be9926f98483d6c276ed0ce2274e8aa17ffbb95056a2a2fd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3090 22416 bytes
font_01_sfnt_off00006235.bin
1b4d93afac4503d2e36b3bf2bfebb7bade0bbcb15e92d540dbc769c4ae5b55d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6235 19016 bytes

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