Malicious PDF — malware analysis report

Static analysis result for SHA-256 b646efd3eb97679e…

MALICIOUS

PDF

45.8 KB Created: 2021-05-30 14:30:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d42155b129f1625d8582c9af7e9eefdc SHA-1: c1d7826ad5990249cae1710011b2781bcc230ae7 SHA-256: b646efd3eb97679ebc820e9db46864167d69e6c71f588c844949316070c9eaa3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to websites offering 'free Robux' or similar game-related incentives. This suggests a phishing or scam campaign designed to lure users to potentially malicious sites. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9580

Heuristics 4

  • 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.
  • 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/free-robux-website-game-hack
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/how-to-get-minecraft-for-free-on-mac_GM479516143.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/free-robux-no-verification_GM431946152.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/free-coins-and-spins-coin-master_GM406889139.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/mine-minecraft-games-for-free_GM479516143.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/you-promised-my-son-free-robux_GM431946152.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/free-tiktok-bots_GM835599320.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/free-robux-script_GM431946152.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/free-robux-no-human-verification-or-survey_GM431946152.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/how-to-get-free-coins-on-tiktok_GM835599320.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/how-to-get-followers-on-tiktok-for-free_GM835599320.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/coin-master-free-daily-spins-link_GM406889139.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/free-robux-generator-no-verification-2021_GM431946152.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/free-robux-generator-2021_GM431946152.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/bloxpink-free-robux_GM431946152.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/free-tiktok-followers-no-human-verification-or-survey_GM835599320.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/how-to-hack-roblox_GM431946152.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/free-robux-with-no-verification_GM431946152.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/free-robux-no-verification-2021_GM431946152.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/how-to-get-free-robux-without-human-verification_GM431946152.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/coin-master-free-soins_GM406889139.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/coin-master-free-spins-link_GM406889139.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/free-spins-coins-coin-master_GM406889139.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/how-to-hack-a-roblox-account-easy_GM431946152.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/mobihack-net-roblox-hack_GM431946152.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/get-free-robux-no-human-verification_GM431946152.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://futureselect.com.au/wp-content/uploads/fsqm-files/coin-master-free-cards_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000567f.bin
ca79319aba56ff55cedcea3841b747a405f9014f9cc7c48360b7dfb12adf65b1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x567F 25416 bytes
font_01_sfnt_off00008f6a.bin
681a9996b59f8391b7cc91011c49ef4e68754eb5dc3ad8da1029f3e9c8ab03b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6A 18436 bytes

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