Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e70b6c9aaa38f8…

MALICIOUS

PDF

34.9 KB Created: 2021-07-03 17:48:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0d5f413e71814ca8c392fddb66ea21fd SHA-1: 71e6bbb2fcd19fbba8931da136c71745ab239309 SHA-256: d1e70b6c9aaa38f82c8d822acd832602ae70f0d0eb4a1ea0832eb4f8d19e2d3c
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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.tw/app/431946152/how-you-get-robux-game-hack PDF link annotation
    • https://www.knjigebuducnosti.com/files/mathep_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/robuxian-robux-hack-prison-klife_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/can-u-make-t-shirts-for-free-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/hack-para-roblox-para-matar_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-premium-membership-hack_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/pubg-uc-rate-in-pakistan_GM1330123889.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/completely-black-pants-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-faces-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-have-script-for-hack-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/what-is-free-roblox-generator_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/robux-hack-no-human-verification-needed_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/app-to-earn-free-robux-for-downloadign-games_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-generator-no-survey_GM431946152.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
font_00_sfnt_off00002f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F92 23056 bytes
SHA-256: 03968c902b2f7b2648e366da6237dab28ca254bc8fda67db93b4c118e6576b20
font_01_sfnt_off00006366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6366 18984 bytes
SHA-256: 56fa757f9e5a49b5a9868cb781ce682672aa068df69e370ec5b10dcd658c13b5

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