Malicious PDF — malware analysis report

Static analysis result for SHA-256 288cb4b8eecaf683…

MALICIOUS

PDF

52.1 KB Created: 2021-06-13 15:01:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7c2128ee2e948fd7d154ebc30d7e6078 SHA-1: b505a04286a534f9e4f11cbef5ad7f87a4f6a5e4 SHA-256: 288cb4b8eecaf683158e4c803728c6bd78271cadf12f3de93cd94cae335738ee
142 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 structured as SEO-friendly slugs, suggesting a link farm or content aggregation tactic. The presence of a fake CAPTCHA heuristic indicates an attempt to trick the user into interacting with the document, likely by clicking on these links. The primary URL, http://netcdn.co/app/431946152/how-to-purchase-robux-for-free-game-hack, is directly embedded and suggests a lure related to in-game currency or cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.co/app/431946152/how-to-purchase-robux-for-free-game-hack
    • http://katalog.iain-padangsidimpuan.ac.id/repository/roblox-rape-hack_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/coin-master-free-spins-and-coins-haktuts_GM406889139.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/can-u-get-free-robux_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/coin-master-free-coins-no-human-verification_GM406889139.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/free-face-roblox-face-anime-girl_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/cheat-engine-roblox-no-cooldown_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/free-coin-master-hack-no-verification_GM406889139.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/greenlegocats-how-to-get-free-robux_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/earn-robux-for-roblox_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/free-spin-generator-for-coin-master_GM406889139.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/free-unlimited-robux_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/free-robux-with-no-verification_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/cwis-free-robux-gen-version-30-updated_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/coin-master-free-pin_GM406889139.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/roblox-robux-generator_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/free-tiktok-likes-no-survey_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005591.bin
3c6af36b826718dcb4f3ecd21d165fe822d77fd348108829ca3b17953d5f6e54		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5591 26004 bytes
font_01_sfnt_off00009104.bin
db1860fd79a3f2cbe32e2bada3ba4c68a2d581b7a24294387cd777233cc9cef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9104 2828 bytes
font_02_sfnt_off00009ab6.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB6 5696 bytes
font_03_sfnt_off0000a7c7.bin
7d4422301a0b7e889744ec20107ddddcb34f483b5c62f66746a41162a7d0e65d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7C7 18724 bytes

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