Malicious PDF — malware analysis report

Static analysis result for SHA-256 22483ea9321843d4…

MALICIOUS

PDF

49.1 KB Created: 2021-06-06 23:27:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9d8f341968c12664d380152a8ea92492 SHA-1: 0b6133f14bafa6e10e95bc126e213096f81c2056 SHA-256: 22483ea9321843d429e92126ab605427eb2721ade087347ec053c9f20dfca5c0
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure for free Robux, impersonating Microsoft, and directs users to a malicious redirector URL. The ML classifier strongly indicated maliciousness, and the embedded link is flagged as a known malicious redirector. While no scripts were extracted, the document's structure and embedded links suggest an attempt to trick users into visiting a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.com-get-free-robux-only-today-adverts-click-link-below-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.com-get-free-robux-only-today-adverts-click-link-below-game-hack In PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/hack-robux_GM431946152.pdfIn PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/free-coin-master-spin-generator_GM406889139.pdfIn PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/grab-points-login_GM431946152.pdfIn PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/roblox-website-robux_GM431946152.pdfIn PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/is-free-robux-real_GM431946152.pdfIn PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/how-to-sue-roblox_GM431946152.pdfIn PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/coin-master-free-mighty-lion-card_GM406889139.pdfIn PDF document text
    • https://learning.man1kabgorontalo.sch.id/__statics/gudangsoal/files/earn-robux-for-roblox_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_off000058ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x58FF 28196 bytes
SHA-256: f64169afc5104abff27898bc6822c91dade56d463cc7f072432d900a362c0726
font_01_sfnt_off0000999d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x999D 19668 bytes
SHA-256: 2ffef4f16c0a6d81ce1ba69148fb1142f2f67a1941c6eb3b0563bfb440bde61c

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