Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d721b5d3f121f13…

MALICIOUS

PDF

43.9 KB Created: 2021-05-16 19:03:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 30d785e1449d283f366ed43858a8769c SHA-1: 7d4ffc1e49877b9d15a765b7b5ee3a7b478821a5 SHA-256: 2d721b5d3f121f130fecd4c41f36988913cd2c6bf266dcfacc4a33a2ed50aacf
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links to external PDF files, a technique often used for SEO spam or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of a call-to-action phrase reinforces the deceptive nature of the document. The primary IOC is the external URL that the document directs users to.

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/431946152/roblox-mobile-hack-game-hack
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-pet-snacks_GM406889139.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-spin-link-app_GM406889139.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/free-spin-coin-master-new-link_GM406889139.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/game-hunters-coin-master_GM406889139.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/free-robux-with-no-human-verification_GM431946152.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/spin-hack-for-coin-master_GM406889139.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/free-limiteds-roblox_GM431946152.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/how-do-you-hack-roblox_GM431946152.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-spin-and-coins-links-home_GM406889139.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/free-robux-no-verification-2021-ios_GM431946152.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/free-cheat-codes-for-coin-master_GM406889139.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/coin-master-working-hack_GM406889139.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/free-minecraft-skins-ps4_GM479516143.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/how-to-hack-any-roblox-account_GM431946152.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/free-minecraft-mods-for-xbox-one_GM479516143.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/como-hackear-el-juego-coin-master-en-espaol_GM406889139.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/free-promo-codes-for-robux_GM431946152.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/minecraft-survival-hacks_GM479516143.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/roblox-redeem-codes-free_GM431946152.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c26.bin
757527086d62ac62e883e42cc5726c9ee647c1a22b99e1938471346b8d491c6c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C26 26216 bytes
font_01_sfnt_off000088d9.bin
e5e44b7d88d65c0aa39187413bdce35fa7eb26b841b7c8af9c826d312b99eefc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88D9 18500 bytes

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