Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3949b21681eb18…

MALICIOUS

PDF

45.8 KB Created: 2021-05-11 03:13:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8ec2da5ab0c81bbb12a7ec75eeefca11 SHA-1: 9899b36019e1f3fc6d2687acf40648a595f7abf6 SHA-256: 0b3949b21681eb18a7ec0f67f91046af05d748fbc63413c2392c359da0883573
142 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which appear to be SEO-optimized lures for game hacks and cheats. The presence of a fake CAPTCHA heuristic indicates the document is designed to trick the user into interacting with a malicious link, likely to download a second-stage payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/fbchampion-game-hack
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/coin-master-unlimited-spin-hack-apk_GM406889139.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/300-daily-free-spins-coin-master_GM406889139.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/haktuts-coin-master-free-spin-today_GM406889139.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/how-to-hack-someones-roblox-account_GM431946152.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/free-robux-generator-2021_GM431946152.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/free-coins-coin-master-spins_GM406889139.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/is-minecraft-bedrock-edition-free_GM479516143.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/coin-master-apk-hack-32_GM406889139.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/coin-master-cards-free-cards_GM406889139.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/more-robux_GM431946152.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/links-for-free-spins-for-coin-master_GM406889139.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/robux-free-gift-card-org-hack_GM431946152.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/free-robux-without-verification-2021_GM431946152.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/coin-master-game-free-spin-download_GM406889139.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/coin-master-hacks-and-cheats_GM406889139.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdf
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/roblox-free-robux-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b6e.bin
836d868ebcc2ace66d6373dcc52942cf470a1686a997a106709e68c24865e4d5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B6E 25456 bytes
font_01_sfnt_off000086d4.bin
96a70491b0783ad8c6fc9b11a18f021aa22c69ac41ee4499b781d16a1b99b689		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86D4 2820 bytes
font_02_sfnt_off00009075.bin
a6b0af27d4d3b45433f1bf9322c4fc5530f0836706fea914cb1eef9ee3408c10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9075 18364 bytes

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