Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f9b9852b9e8d38…

MALICIOUS

PDF

48.4 KB Created: 2021-06-02 08:10:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b3757fc43fbc66095830f0cb3b6b3a04 SHA-1: 5467a0214097eb0326cc318d0f2ccaeda718eadf SHA-256: f2f9b9852b9e8d38c6c50508f8263ce866532f8021de10df02a5075f2c66fab7
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 0.9796

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 https://netcdn.xyz/app/431946152/cheat-roblox-mad-city-kick-game-hack PDF link annotation
    • http://lawpatron.ru/images/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/coin-master-mod-version-free-download_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://lawpatron.ru/images/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/roblox-printables-free_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/coin-master-gift-link-hack_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/coin-master-free-spins-apk-2021_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://lawpatron.ru/images/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/free-25-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/coin-master-apk-hack-mod-download_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005160.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5160 25888 bytes
SHA-256: 845c3f4e39efeb1181ee5ed29da3600f0408d04820508ded7623a92c1cd05e89
font_01_sfnt_off00008d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D6A 3084 bytes
SHA-256: 4889dc98a6bfd3c9244583f92387be58625a91e7a969778ad35ada89b27ed636
font_02_sfnt_off00009810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9810 19124 bytes
SHA-256: c13ae3e389c3d7ab68808b7d02b78e76df1baa53a219310d4f5ecf7e443ab56f

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