Malicious PDF — malware analysis report

Static analysis result for SHA-256 81af3c0fa826f72f…

MALICIOUS

PDF

49.9 KB Created: 2021-06-13 21:50:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0073f50875fceabbebe49b38d5e1a582 SHA-1: 2a821d61a3907e88f80d0d54f9b458bde797b9e0 SHA-256: 81af3c0fa826f72fead38272c9bea58ee85c1c4f9bf1c9b78d88e25b40ae3938
82 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and a call-to-action lure impersonating Facebook to trick users into downloading a free Robux hack. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple suspicious URLs indicates a credential phishing or malware distribution attempt. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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: http://netcdn.co/app/431946152/free-robux-on-ipad-pro-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 http://netcdn.co/app/431946152/free-robux-on-ipad-pro-game-hack PDF link annotation
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/veos-fun-roblox-hack_GM431946152.pdfIn PDF document text
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/free-generator-for-card-roblox-robux_GM431946152.pdfIn PDF document text
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/free-100-robux-2021_GM431946152.pdfIn PDF document text
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/roblox-brightness-hack_GM431946152.pdfIn PDF document text
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/esp-roblox-hack_GM431946152.pdfIn PDF document text
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/free-roblox-shirt-templates-free-shipping_GM431946152.pdfIn PDF document text
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/how-to-get-free-penguin-costume-on-roblox_GM431946152.pdfIn PDF document text
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/roblox-team-fortress-2-free-to-play_GM431946152.pdfIn PDF document text
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/roblox-las-vegas-money-hack_GM431946152.pdfIn PDF document text
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/free-roblox-generator-activation-key_GM431946152.pdfIn PDF document text
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/how-to-cheat-to-get-robux_GM431946152.pdfIn PDF document text
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/roblox-insert-tool-hack_GM431946152.pdfIn PDF document text
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/free-crown-for-roblox_GM431946152.pdfIn PDF document text
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/get-roblox-r-free-on-android_GM431946152.pdfIn PDF document text
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/roblox-breaking-point-hack-script_GM431946152.pdfIn PDF document text
    • https://altaviastagerace.it/wp-content/uploads/fsqm-files/hack-para-teletransportarse-en-roblox_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_off00004d55.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D55 37456 bytes
SHA-256: 9a58500f250a6ee874033e19b5dd932f45b68186c780f66a07aee0c5cd61a814
font_01_sfnt_off00009fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FEF 18744 bytes
SHA-256: 8cc0f83fa3c604bf0b33af2b9332da8b1d0b81549aaebaf7361ecf1ea719d237

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