Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd92dd9c3faa1c9…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 02:21:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9ec9cafe40770bad179cb55f686b35c6 SHA-1: 64cc834a0b5b2fd8b51b50f64fcf2bbf7233c297 SHA-256: 9dd92dd9c3faa1c992296aa0d0fe1ef3a8a857e32731f0e4ef0bd7e7ab37a840
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free Robux' and game hacks. The document body and embedded URLs strongly suggest a phishing or scam attempt designed to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious redirection, likely leading to further malware or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/free-robux-just-enter-username-game-hack In PDF document text
    • http://opac.acehresearch.org/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/how-to-get-free-robux-using-game-guardian_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/olais-only-robux-hack_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/hacked-roblox-accouts-username-and-password_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-robux-glitches-2021_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/password-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/roblox-free-downlow_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-robux-codes-2021-november_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-apk-hack-3527_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
font_00_sfnt_off00002f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F2A 22964 bytes
SHA-256: 363e0f1dc8a5d8f2ff90436cd5f13c2c99b188f39fcacb963a467427aa334289
font_01_sfnt_off00006256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6256 19244 bytes
SHA-256: bb42f0e36b7288fba8af59efb142b286361a630cbb1699ef387bab73f1413400

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