Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6afba616e2970e…

MALICIOUS

PDF

44.0 KB Created: 2021-06-11 11:05:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 37df03b85e88c6cbeb1f790a578270cf SHA-1: 6dd9ab82e1ab71bd4f33906678604082ea779b09 SHA-256: cf6afba616e2970e6647531f96c9bbdad0a2fc30ede529fe42b7583cfc207164
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 SEO-optimized and point to game-related cheats and hacks. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to trick the user into interacting with the document, likely to download a payload or visit a malicious site. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/roblox-robux-hack-tool-apk-game-hack PDF link annotation
    • http://parsbaft.com/images/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://parsbaft.com/images/free-gift-cards-robux-codes-no-survey_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://parsbaft.com/images/roblox-change-robux-pastebin-hack_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/free-views-tiktok_GM835599320.pdfIn PDF document text
    • http://parsbaft.com/images/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • http://parsbaft.com/images/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://parsbaft.com/images/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://parsbaft.com/images/getrobux-now_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/how-you-get-robux_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/coin-master-time-hack_GM406889139.pdfIn PDF document text
    • http://parsbaft.com/images/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/150-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f34.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F34 24876 bytes
SHA-256: 2b1d610d8981a3a6ceea542042e4fd23975f6e1945fa8ea01a8875ba224d0e21
font_01_sfnt_off000088c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88C9 18500 bytes
SHA-256: ad72fbb382da27713e30c035cb8b614c8953fae17202cffb284573be9ca564f1

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