Malicious PDF — malware analysis report

Static analysis result for SHA-256 79efb8b31cd2c526…

MALICIOUS

PDF

44.7 KB Created: 2021-06-13 22:46:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2881909c9e1639a62b18eaefb64c11e1 SHA-1: b1ea7901f34c2538fdda65acdb83183999f80b96 SHA-256: 79efb8b31cd2c526964bd6d7bac8b1b10cf222c10f855cbfd9158c75bd90f634
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a credential phishing lure, specifically impersonating Facebook and offering game-related cheats for Roblox. The embedded URLs, such as http://netcdn.co/app/431946152/roblox-shower-simulator-free-vip-game-hack, are designed to redirect users to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/roblox-shower-simulator-free-vip-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/roblox-shower-simulator-free-vip-game-hack PDF link annotation
    • http://library.persadabunda.ac.id/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-800-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-do-i-recover-my-childs-hacked-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/freerobux-hack-us_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/hack-the-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/roblox-i-cheated-for-this-box_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://www.bandicam.comIn 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_off00004972.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4972 26928 bytes
SHA-256: 59065a17b215fb9dabfb32ba8ba3af6dedfb4987e59510d53c2716ab46830825
font_01_sfnt_off00008927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8927 19440 bytes
SHA-256: 9ae2f9943dd70a3f4d3ef39f21ffd11a6fab72d47054888f96db7fbba36a935b

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