Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3528d5cca6bb65…

MALICIOUS

PDF

50.4 KB Created: 2021-06-03 13:44:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 394b502b500ceda06acdf714e8976124 SHA-1: 20a8ce84661ae696270c3f8a88536112ae19cb52 SHA-256: 2d3528d5cca6bb658301c3ae99677de328b4fde3a778df883d9c421209c359e1
122 Risk Score

Malware Insights

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

The PDF document contains a link impersonating the Microsoft Store to lure users with promises of free Robux and game hacks. This is a common tactic for credential phishing or distributing further malware. The embedded link directs to a suspicious domain, and the ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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.online/app/431946152/microsoft-store-robux-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.online/app/431946152/microsoft-store-robux-game-hack PDF link annotation
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-hack-2021-apk-download_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-coin-link_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/android-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/roblox-website-robux_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005495.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5495 30680 bytes
SHA-256: e84bd5974adb6173aed32ec8a669f68d736b41fc7d6a7057601b63dbe468387f
font_01_sfnt_off000098ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98AD 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off0000a297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA297 18268 bytes
SHA-256: 49f3a296214ad619b3e73d3af963f60c94e5a71fbfe3287d32f07039f79e8fa2

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