Malicious PDF — malware analysis report

Static analysis result for SHA-256 512805db929509c2…

MALICIOUS

PDF

33.2 KB Created: 2021-07-09 22:48:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 15ca03da4c2f03d44399c909c4a762d6 SHA-1: cf358fff39c46ecd19b8f7461470e44864f66972 SHA-256: 512805db929509c2df54e9603920b99a6d357a55ae8382149171727c28b91f77
200 Risk Score

Malware Insights

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

The PDF document contains multiple links designed to lure users into clicking on them by impersonating popular brands and offering free in-game currency or items. The primary link redirects to a known malicious domain, indicating a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious website, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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: http://netcdn.tw/app/431946152/roblox-premium-free-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 http://netcdn.tw/app/431946152/roblox-premium-free-game-hack In PDF document text
    • https://www.metal.hr/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/pubg-uc-2021_GM1330123889.pdfIn PDF document text
    • https://www.metal.hr/files/free-coin-master-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/free-coin-master-spin-generator_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-gfet-cheat-engine-to-work-with-roblox_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/free-giftcards-de-roblox_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/free-minecraft-account-list_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/cch-ly-robux-free-2021_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
font_00_sfnt_off00002bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BB0 21852 bytes
SHA-256: 30290451608339c3882a65acbac17532eb35bb62b287a6fb1876e0b4386ab1ce
font_01_sfnt_off00005c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C03 19324 bytes
SHA-256: c8a2b1ae1c1508803a3d8c69ed3754c7f46d1063272e7458056edfc0801350b1

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