Malicious PDF — malware analysis report

Static analysis result for SHA-256 732afebe4dd596dd…

MALICIOUS

PDF

42.3 KB Created: 2021-05-18 05:20:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ccdf35b0dbb802c621479362cdcbe13a SHA-1: 768064e280034f448b39f4c61db8db62024643ca SHA-256: 732afebe4dd596dde5421d4cdaa91dedfe5a435f37e5521f293ad9c9bdc54706
142 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are SEO-optimized and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The presence of a fake CAPTCHA lure and a download button suggests an attempt to trick the user into clicking these links. The ML classifier also strongly flagged this PDF as malicious. The primary goal appears to be redirecting users to scam or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-download-hack-game-hack
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/free-robux-generator-no-verification-2021_GM431946152.pdf
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/funbloxxyz-free-robux_GM431946152.pdf
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/get-free-robux-no-verification_GM431946152.pdf
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/how-to-get-free-things-on-roblox_GM431946152.pdf
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/earn-free-robux-for-roblox_GM431946152.pdf
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/free-robux-come_GM431946152.pdf
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master-iphone_GM406889139.pdf
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/free-robux-not-fake_GM431946152.pdf
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/free-robux-easy_GM431946152.pdf
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/roblox-gift-card-for-free_GM431946152.pdf
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/coin-master-hack-2021-no-human-verification_GM406889139.pdf
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/coin-master-village-4_GM406889139.pdf
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/best-free-minecraft-server-hosting-reddit_GM479516143.pdf
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-generator_GM431946152.pdf
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/is-minecraft-free-on-pc_GM479516143.pdf
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/robloxfun-com-robux_GM431946152.pdf
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/bit-ly-coin-master-hack_GM406889139.pdf
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/free-robux-for-free_GM431946152.pdf
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/coin-master-free-spin-no-offers_GM406889139.pdf
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ae0.bin
bc19e103c0ff46d6cebc456dc580f47c15939117f302683494b7017b99efbc31		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AE0 24456 bytes
font_01_sfnt_off000082e4.bin
7196709c2759277e2e42e139668fa96563a46faba9c7eb1d5fb5a9848ee95e79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82E4 18296 bytes

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