Malicious PDF — malware analysis report

Static analysis result for SHA-256 1715784ff91e31d0…

MALICIOUS

PDF

46.9 KB Created: 2021-06-09 04:45:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 45812e948d67266b42334e9c1d3e2321 SHA-1: d4e176f6f6713c901037b8e7cf3f88b7f6de8cf9 SHA-256: 1715784ff91e31d000ee2bc2bdddb3b3b66fe20088489da00781a3aed5edce55
82 Risk Score

Malware Insights

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

The PDF document contains a lure related to free Robux, impersonating Facebook and directing users to external URLs. The ML classifier strongly indicates maliciousness, and the presence of brand impersonation for credential phishing suggests a likely attack pattern. While no scripts were directly extracted, the embedded URLs are the primary indicators of compromise, likely leading to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/431946152/20210-robux-free-scam-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/431946152/20210-robux-free-scam-game-hack PDF link annotation
    • http://medinup.pt/images/robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-random-robux-codes_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/free-4l-tiktok_GM835599320.pdfIn PDF document text
    • http://medinup.pt/images/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-tiktok-followers-no-survey-or-verification_GM835599320.pdfIn PDF document text
    • http://medinup.pt/images/minecraft-cheats-pc-2021_GM479516143.pdfIn PDF document text
    • http://medinup.pt/images/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://medinup.pt/images/roblox-pal-hair-free_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://medinup.pt/images/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/minecraft-ps4-free_GM479516143.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_off00004eee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EEE 31100 bytes
SHA-256: 6d4424cd87a2c985ca637d5a07d2eb8b3583f30a883fd2d1e0398328be3ea9f1
font_01_sfnt_off000092e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92E9 18904 bytes
SHA-256: b818fa9640c54c6dda918e2323aa4dcfd97bdfb6848b9d7590282c98970e0a10

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