Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef8f9a16a42365a…

MALICIOUS

PDF

45.2 KB Created: 2021-06-04 02:22:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f11b0132e37914b2f51b3f803bf4d304 SHA-1: b20b887a1149375aab82f2d92f8c7227973d0fb4 SHA-256: 6ef8f9a16a42365abd45d0ec0c8c8a0e4338f006dfb8bbc41ac1deec9c198a92
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 promising free Robux or game hacks, impersonating the Microsoft brand. These links redirect to malicious infrastructure, indicating a credential phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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: https://netcdn.online/app/431946152/get-me-free-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
  • 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/get-me-free-robux-game-hack In PDF document text
    • http://www.opac.stieimalang.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/roblox-free-executor_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/how-to-get-minecraft-bedrock-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/robux-sign_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-robux-today_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/minecraft-bedrock-hacks-windows-10_GM479516143.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-spin-app-coin-master_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_off00005235.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5235 25616 bytes
SHA-256: cb88f9ffed4d74640f6f6169d3f77be5abcf77f2ab07895691ba8c524a187615
font_01_sfnt_off00008e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E2D 18312 bytes
SHA-256: e3f176f8735a7a9c211288ec5f3dfc0a25536bb398bd4870e4b297ba4f960079

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