Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a7703e3bcbf5a8…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 18:49:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7929f96d6b2b62a38e22ff902cb926c6 SHA-1: e5c069f85121024926de0e7803c3f3415f19a385 SHA-256: 25a7703e3bcbf5a840e6f3735c876841ae85078fd114f7d464e0017970ee5a60
240 Risk Score

Malware Insights

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

The PDF document contains multiple links to a redirector URL that impersonates Microsoft and offers 'free Robux' or game hacks, disguised as a CAPTCHA or download lure. The ML classifier also flagged this PDF as malicious. The primary malicious link identified is https://netcdn.online/app/431946152/robux-no-verification-game-hack, which likely leads to a credential phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/robux-no-verification-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.online/app/431946152/robux-no-verification-game-hack In PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/roblox-executor-free_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/mangocheats-com-hack-coin-master-cheat_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/cm-spins_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/minecraft-sign-up-free_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/roblox-moderators_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/send-me-500-2021-spins_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-free-fire_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://rblx.landIn 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
font_00_sfnt_off000053ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53BA 25728 bytes
SHA-256: 86f6b0b241fe3965a4b526505f22b0aa3c416fd12ed27ac366dcb0df5b4c70cf
font_01_sfnt_off00008fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB7 18436 bytes
SHA-256: 7bd58a32436a1cd7e6b960dae53a6923ed98c563d453e9d292140b8243cceb65

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