Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb59ae0781de40b5…

MALICIOUS

PDF

43.0 KB Created: 2021-05-11 01:00:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 770818b481d927924fa750e5a51a0bd5 SHA-1: c93aa8fe42dc07e4c09afef33f1cd3634ae9315f SHA-256: fb59ae0781de40b5b44f1aaa6b4d5737ce0f1c9069bd2c7d21743f77e5b0ba0e
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA and a download button lure to trick users into clicking embedded links. The primary link leads to a known malicious redirector infrastructure, suggesting an attempt to deliver a secondary payload or phish for credentials. No scripts were extracted, but the PDF structure and embedded links are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/431946152/free-limiteds-roblox-game-hack In PDF document text
    • http://hilro.co.za/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://hilro.co.za/images/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://hilro.co.za/images/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://hilro.co.za/images/coin-master-spins-gratis_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/cute-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/coin-master-game-hacking-tricks_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/coin-master-game-download-free_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/free-roblox-groups_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
stream_003_off00004904.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4904 26024 bytes
SHA-256: d5dfaee6be47b47fab31b8abfa2a9df4cbc78c6c0650e8ef2dcf8a8e53efda8e
font_01_sfnt_off000084a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84A1 18604 bytes
SHA-256: cd6e3b888b69b87eccf2bd9bf0eaf83aa01cccd071b198ee6fa00879ae765b94

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