Malicious PDF — malware analysis report

Static analysis result for SHA-256 e057cd44cf0fdd3e…

MALICIOUS

PDF

44.3 KB Created: 2021-06-09 02:12:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 36bb22d874115cc73d0e96711a1a633b SHA-1: 9b6842037eb479d62c1e0b403c2b92d1356d30b6 SHA-256: e057cd44cf0fdd3edfe3b855cf81d5d8446eda6f2cf51314b5416c6e08a4e3cf
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains a lure for free Robux, directing users to a suspicious URL. The presence of embedded URLs and a ML classifier flagging the PDF as malicious strongly indicates a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to a malicious site, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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.tw/app/431946152/earn-robux-online-free-game-hack
    • https://www.aubay.com/wp-content/uploads/fsqm-files/free-robux-generator-for-kids_GM431946152.pdf
    • https://www.aubay.com/wp-content/uploads/fsqm-files/roblox-free-tshirts_GM431946152.pdf
    • https://www.aubay.com/wp-content/uploads/fsqm-files/180k-robux-hack_GM431946152.pdf
    • https://www.aubay.com/wp-content/uploads/fsqm-files/how-to-get-free-robux-no-verification_GM431946152.pdf
    • https://www.aubay.com/wp-content/uploads/fsqm-files/minecraft-free-download-mac_GM479516143.pdf
    • https://www.aubay.com/wp-content/uploads/fsqm-files/roblox-cheats-pris_GM431946152.pdf
    • https://www.aubay.com/wp-content/uploads/fsqm-files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdf
    • https://www.aubay.com/wp-content/uploads/fsqm-files/minecraft-xray-hack_GM479516143.pdf
    • https://www.aubay.com/wp-content/uploads/fsqm-files/how-to-hack-roblox-bee-swarm-simulator_GM431946152.pdf
    • https://www.aubay.com/wp-content/uploads/fsqm-files/easiest-character-to-make-a-roblox-account-for-free_GM431946152.pdf
    • https://www.aubay.com/wp-content/uploads/fsqm-files/roblox-all-clothes-free_GM431946152.pdf
    • https://www.aubay.com/wp-content/uploads/fsqm-files/coin-master-daily-free-spin-app_GM406889139.pdf
    • https://www.aubay.com/wp-content/uploads/fsqm-files/comment-hacker-des-map-roblox-roblox_GM431946152.pdf
    • https://www.aubay.com/wp-content/uploads/fsqm-files/roblox-hack-sharder_GM431946152.pdf
    • https://www.aubay.com/wp-content/uploads/fsqm-files/roblox-dubliezieren-hack_GM431946152.pdf
    • https://www.aubay.com/wp-content/uploads/fsqm-files/how-to-upload-music-to-roblox-for-free-2021_GM431946152.pdf
    • https://www.aubay.com/wp-content/uploads/fsqm-files/coin-master-free-spins-2021_GM406889139.pdf
    • https://www.aubay.com/wp-content/uploads/fsqm-files/cheat-codes-vhicule-simulator-roblox_GM431946152.pdf
    • https://www.aubay.com/wp-content/uploads/fsqm-files/get-free-tiktok-likes_GM835599320.pdf
    • https://www.aubay.com/wp-content/uploads/fsqm-files/roblox-cheat-2021-fr_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050fd.bin
fb3a7d91057fd4d6ef4d74f005f4cc3fd795f9517eb82745550de81216172a77
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50FD 24768 bytes
font_01_sfnt_off00008a30.bin
c5d72eab89aba32c2c6823d620195b65ffc38cea86e9d43614d7482f2f2a6249
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A30 18436 bytes