Malicious PDF — malware analysis report

Static analysis result for SHA-256 254bb025040b7619…

MALICIOUS

PDF

42.7 KB Created: 2021-05-19 03:03:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c358c722519f9413283eb6acf8fb8f22 SHA-1: 88df894864d18b125c0de39ca29c8bed71a937e9 SHA-256: 254bb025040b7619c30fd0fa70f61af3647745f5514ae754010327be724d1eb2
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to potentially malicious content. The presence of a "download button" heuristic and the ML classifier's high confidence score indicate a malicious intent. The primary attack pattern involves luring users to click on these links, which likely lead to malware downloads or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/1094591345/pokemon-go-free-pokeballs-2021-game-hack
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/play-roblox-for-free-on-google_GM431946152.pdf
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/free-pet-food-coin-master_GM406889139.pdf
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/blogspot-free-spins-coin-master_GM406889139.pdf
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdf
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/rbx-gg-free-robux_GM431946152.pdf
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/haktuts-coin-master-free-spins_GM406889139.pdf
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/roblox-free-hair-girl_GM431946152.pdf
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/hack-free-spin-coin-master_GM406889139.pdf
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/free-coin-master-glitches_GM406889139.pdf
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/roblox-free-draw_GM431946152.pdf
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/how-to-get-free-robux-no-human-verification_GM431946152.pdf
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/coin-master-free-400-spin-link_GM406889139.pdf
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/free-minecraft-skins-java_GM479516143.pdf
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/free-robux-codes-no-human-verification_GM431946152.pdf
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/coin-master-hacks-for-spins_GM406889139.pdf
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/roblox-dominus-free_GM431946152.pdf
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/how-to-get-800-robux-for-free_GM431946152.pdf
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/free-game-packs-for-coin-master_GM406889139.pdf
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/play-minecraft-for-free-on-pc_GM479516143.pdf
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/coin-master-hack-apk-33-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a4e.bin
11c9d0cd4f36a3011a6f23d1a5395d072da2f7a2a42c95c4ef16295522c46c7d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A4E 25132 bytes
font_01_sfnt_off00008373.bin
f9b6f5e2eacc699a9c404c997ad8b2ecdd4e29e7777dbc82987499eb8696c76c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8373 18704 bytes

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