Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db536c6c2cde38c…

MALICIOUS

PDF

33.8 KB Created: 2021-06-27 10:08:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e67eff584166e89de49bddb0a3f55333 SHA-1: a9e533c86c27f5c6fc856467c0d7594cec065509 SHA-256: 0db536c6c2cde38c9646fc51e4aa4bd6c7ef32ca2ab6296953d9233284f44072
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.co/app/431946152/instaler-un-cheat-pour-roblox-phamtom-forces-game-hack PDF link annotation
    • https://lib-stie.yai.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/hacks-codes-in-roblox-prove-it_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/synapse-free-roblox_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-guess-that-character-for-free-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-mega-gift_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/hack-para-atravesar-paredes-rn-roblox_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-credit-card_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/coin-master-hack-without-verification-2021_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
font_00_sfnt_off000030a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A9 20984 bytes
SHA-256: f086fa5f7dc90cd47124150a30790a9ea03769ac00b5f12f7e656660ce044234
font_01_sfnt_off00005e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E04 19472 bytes
SHA-256: 0d32d38a1307c7e6e73aad1b722ac611b30dd6ed59e09ae75b6450908d913357

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