Malicious PDF — malware analysis report

Static analysis result for SHA-256 b567977674946419…

MALICIOUS

PDF

45.0 KB Created: 2021-06-11 04:20:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6a5e23cff0a3f32dea719795a16b6790 SHA-1: e9df8e42dc72777572eecf9e008015c48487e98c SHA-256: b567977674946419f4b2741479f0a54d5f4d0483c631adb243e5502f91b1132a
140 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a RAR archive, masquerading as game cheats or hacks. The heuristic firings indicate the document impersonates PayPal and uses a visual download button to lure users. The primary malicious URL identified is https://netcdn.tw/app/431946152/roblox-hack.rar-2021-game-hack, which is flagged as a redirector to known malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/roblox-hack.rar-2021-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/roblox-hack.rar-2021-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/tiktok-free-2021-likes_GM835599320.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-speed-hack-las-vegas-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/freespins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hack-coin-master-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-heaven_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-galaxy-wyrm-still-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-minecraft-website_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-survey-for-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-today_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-spins-free_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_off00004fd6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FD6 26328 bytes
SHA-256: a4dad8e2efab7c8e91d1383300693a747075ea785b52068ca6e29554ffc07ed1
font_01_sfnt_off00008c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C26 18652 bytes
SHA-256: 3141dcadbcb150d21f913803c32aa70e95ff5365657f7e9c8b2b0efcb687e3a8

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