Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a16c2611e3fb99…

MALICIOUS

PDF

45.8 KB Created: 2021-06-07 05:04:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 698118466c81bc4a8757ac85bca177f6 SHA-1: d9a9ac8970167e099e7cfe82526b0f4aa94dc4db SHA-256: 63a16c2611e3fb992e21aadbc44d3608cde3f322aaa9c00e22efb9bd1192f751
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document impersonates Facebook and uses a lure of free Robux to trick users into clicking a malicious link. The link redirects to infrastructure known for hosting malicious content, and the document itself was flagged by an ML classifier as malicious. The presence of embedded URLs and the nature of the lure strongly suggest a credential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/how-to-get-free-robux-in-roblox-2021-nicktherobloxiant.v-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
  • 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/how-to-get-free-robux-in-roblox-2021-nicktherobloxiant.v-game-hack In PDF document text
    • http://sd-olimp.hr/files/real-roblox_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://sd-olimp.hr/files/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/working-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/roblox-people-girl_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/coin-master-free-in-app-purchases_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/aimbot-download-roblox_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/get-free-robux-2021_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_004_off00005036.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5036 25968 bytes
SHA-256: cfa9926c3fe78b96784a0c794cb8de2298e2793746689a6b88b1aef0e310414c
font_01_sfnt_off00008cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC0 19620 bytes
SHA-256: b30d6c9e668b298dad4e730af99b7e287cf413710927fa9d457f8bc30f5ffa40

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