Malicious PDF — malware analysis report

Static analysis result for SHA-256 43555e7de71b316f…

MALICIOUS

PDF

44.7 KB Created: 2021-05-17 03:02:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f5b8a7091f022dc20771cab1ce2da537 SHA-1: b82b348f4dc89440bba57b4801b36b859ed39086 SHA-256: 43555e7de71b316fdcb58f74037af6672b7a74d5f591c33088065960753facf9
142 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are part of a link farm designed to improve SEO. The presence of a fake CAPTCHA or human verification prompt indicates a deceptive intent to trick users into interacting with these links. The primary goal appears to be driving traffic to SEO-optimized content, potentially for monetization or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/how-to-get-free-spins-on-coin-master-without-verification-game-hack
    • https://ceranique.nl/images/coin-master-daily-free-spins-and-coins_GM406889139.pdf
    • https://ceranique.nl/images/robux-premium_GM431946152.pdf
    • https://ceranique.nl/images/windows-10-minecraft-free-with-java_GM479516143.pdf
    • https://ceranique.nl/images/free-spin-link-of-coin-master_GM406889139.pdf
    • https://ceranique.nl/images/free-spin-link-for-coin-master_GM406889139.pdf
    • https://ceranique.nl/images/how-to-create-group-in-coin-master-free-spins_GM406889139.pdf
    • https://ceranique.nl/images/how-to-get-free-robux-hack_GM431946152.pdf
    • https://ceranique.nl/images/coin-master-free-spins-link-31-march-2021_GM406889139.pdf
    • https://ceranique.nl/images/coin-master-free-spin-group_GM406889139.pdf
    • https://ceranique.nl/images/free-spins-and-coins-for-coin-master_GM406889139.pdf
    • https://ceranique.nl/images/daily-free-spins-coin-master_GM406889139.pdf
    • https://ceranique.nl/images/free-spin-link-in-coin-master_GM406889139.pdf
    • https://ceranique.nl/images/how-to-get-minecraft-bedrock-for-free-with-java_GM479516143.pdf
    • https://ceranique.nl/images/free-roblox-money_GM431946152.pdf
    • https://ceranique.nl/images/free-robux-no-verification_GM431946152.pdf
    • https://ceranique.nl/images/minecraft-bedrock-for-free_GM479516143.pdf
    • https://ceranique.nl/images/hack-coin-master-nyc_GM406889139.pdf
    • https://ceranique.nl/images/oprewards-com-robux_GM431946152.pdf
    • https://ceranique.nl/images/free-robux-generator-2021-no-survey_GM431946152.pdf
    • https://ceranique.nl/images/coin-master-free-spins-link-download-ios_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b37.bin
b40c27949de6c5b9d6db2429d997b1395756ced16b0d3173690b08e16b8de27f
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B37 30140 bytes
font_01_sfnt_off00008b90.bin
34013a01fc9b19de026014672642da8d02f9cc4163dada898040bd77c253fb22
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B90 18688 bytes