Malicious PDF — malware analysis report

Static analysis result for SHA-256 5639c0657d8c4ca4…

MALICIOUS

PDF

45.3 KB Created: 2021-06-10 14:17:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 78543ddd96f8d263793df77147d8645a SHA-1: 0e31930aeca24366aad6d7d4e19e1a578ca82123 SHA-256: 5639c0657d8c4ca44ba1e13ca9de6bac33b8de515220263a0a2ce70f49d6e5fb
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document contains numerous external links, many of which are SEO-optimized and lead to pages related to games like Roblox and Coin Master. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' indicates that the document impersonates brands like iCloud and presents a fake CAPTCHA, strongly suggesting a credential phishing or malicious content lure. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/azon-hack-roblox-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.tw/app/431946152/azon-hack-roblox-game-hack PDF link annotation
    • https://inspiration-modellbau.de/images/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/how-add-robux-to-usesed-roblox-card-cheat_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/how-can-i-get-every-item-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/hack-coin-master-download-ios_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/roblox-online-free_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/dailyrobux_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-hack-tool-robux_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/robux-hack-generator-secret-roblox-hack-revealed_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-robux-android_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/earn-robux_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/robux-robux_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/is-roblox-free-on-xbox-360_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-coins-and-spins-coin-master_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_004_off000050ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50EF 26288 bytes
SHA-256: bace8792871d17fd3dfd73bcbc55ed22465f7e5430ae3407445605c168246c65
font_01_sfnt_off00008e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E76 18264 bytes
SHA-256: 961a3d75b860c76523381e73d32c03265bee59587f7a7782b8078a4be47f0bd4

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