Malicious PDF — malware analysis report

Static analysis result for SHA-256 69aca85bb83b147e…

MALICIOUS

PDF

47.9 KB Created: 2021-06-07 08:46:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1be8debe52508ad3de831c8bf3f3de78 SHA-1: 7525d10ceac20114c774a87a41e45e92365b09ba SHA-256: 69aca85bb83b147ead6244f07de16aa7002db8057472890c51b7670a39db5ec4
82 Risk Score

Malware Insights

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

The PDF document impersonates Microsoft to lure users into clicking a link for 'free Robux', which is a common tactic for credential phishing or malware distribution. The embedded URL `https://netcdn.tw/app/431946152/free-robux-roblox-bots-game-hack` is suspicious and does not match the impersonated brand. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest malicious intent, likely leading to a second-stage download or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 4

  • 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/free-robux-roblox-bots-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/free-robux-roblox-bots-game-hack PDF link annotation
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/dungeon-quest-roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/free-robux-come_GM431946152.pdfIn PDF document text
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/roblox-cheat-engine-fly-hack_GM431946152.pdfIn PDF document text
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/free-robux-no-survey-or-password_GM431946152.pdfIn PDF document text
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/how-do-you-get-robux-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/oprewards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/roblox-jailbreak-speed-hack-update-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/google-why-is-roblox-gettng-hacked_GM431946152.pdfIn PDF document text
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/how-to-hack-in-roblox-fortnite_GM431946152.pdfIn PDF document text
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/how-to-hack-anyone-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/roblox-free-robux-just-give-me-your-password_GM431946152.pdfIn PDF document text
    • https://www.softwaretestingnews.co.uk/wp-content/uploads/fsqm-files/free-robux-generator-no-verification-2021_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_004_off00005743.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5743 29724 bytes
SHA-256: dd4ee11910cc7d2fe51edd7bd7c44306c6ee7dd8c6005b2a397b6643acc55c4f
font_01_sfnt_off00009952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9952 18192 bytes
SHA-256: fe146a91d7cfdaadd7dbf82c60c3c1fce7533eeec38da0a47336b703714dd38b

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