Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39e25c370a92cae…

MALICIOUS

PDF

51.3 KB Created: 2021-06-11 10:41:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c915b9c537142fd5768b9cbc50b999ed SHA-1: 21de2e82bc93851f56149b74be35c645ce3b5e91 SHA-256: f39e25c370a92cae24949d4a1379c16d3fcedb24332a4b605aeb83e51ef47d52
82 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that impersonate the brand Facebook, directing users to a malicious domain for a game hack. The ML classifier strongly flagged this PDF as malicious, and the presence of a call-to-action button further supports a phishing or scam attempt. No scripts were extracted, but the document's structure and embedded URLs indicate a likely attempt to redirect users to a malicious site for credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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/roblox-dex-script-hack-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/roblox-dex-script-hack-game-hack PDF link annotation
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-robux-you-don-t-have-to-do-anything_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-robux-rbx-bc-claims-anb_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/open-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-facebook-page_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/fort-hood-texas-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/artmoney-roblox-hack_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/totally-free-coin-master-spins-2021_GM406889139.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_off0000530a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x530A 36448 bytes
SHA-256: a5bf471f1f687189a453a04bab9da0b416d5d806b430d2dfa9aa7ce9414abf75
font_01_sfnt_off0000a4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4FC 18752 bytes
SHA-256: 9f2275d70525dd5718cd128c0d8c624c4a733c9e95f83f5ed5ccf50322ad4376

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