Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f18cc0c5c821b84…

MALICIOUS

PDF

44.0 KB Created: 2021-05-14 06:45:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4d9f2c7fbe939f9e2037aa924be591b7 SHA-1: 14b60a179040721cc4ca1934ea33c642fc50a43f SHA-256: 6f18cc0c5c821b84ab8b54684f8d21d9e065450cced33e767ec5b570f398e769
182 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA and brand impersonation lure, directing users to a URL associated with game hacks. This suggests a phishing or credential harvesting attempt. The presence of numerous external links, many with SEO-like slugs, indicates a link farm designed to distribute malicious content or traffic. No scripts were extracted, but the PDF structure and embedded links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/406889139/unlimited-spin-coin-master-hack-game-hack.
  • 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/406889139/unlimited-spin-coin-master-hack-game-hack PDF link annotation
    • http://arkivthy.dk/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-hack-org_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-hacks-that-work_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/roblox-free-clothes-codes_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/how-do-i-get-robux_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/free-coins-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-twitter-free-spins_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_003_off000048c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48C3 28436 bytes
SHA-256: 408b7f302d1f920d9cc4f7a51d502fc31f5c9a903888b74639242d1841b0bcd5
font_01_sfnt_off000088c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88C8 18584 bytes
SHA-256: ae98b113e243a6dee09af4228d4dcf65a32797416eb214c6eaedfd928d742d84

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