Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39f596e62bc1777…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 01:49:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 20b5456df19e6aaf4f54efe3c72d3cd8 SHA-1: cc78c564f4d2476919d4846944c2be01b9ff244d SHA-256: c39f596e62bc17773a1ab1648797b3d458178ff59abb29e4c47dcb9941fc58af
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and text referencing 'free Robux' and 'game hacks', designed to lure unsuspecting users. The primary link, http://netcdn.tw/app/431946152/free-robux-codes-no-verification-2021-game-hack, is identified as a malicious redirector. This indicates a phishing or scam attempt, likely to lead users to further malicious content or exploit kits.

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-codes-no-verification-2021-game-hack In PDF document text
    • http://opac.acehresearch.org/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/how-to-hack-for-roblox_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/roblox-skin-creator-free_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/how-to-hack-robux-onto-your-user_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/roblox-how-to-change-your-name-for-free-2021_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-roblox-gift-card-codes-not-used-2021_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-robux-card-numbers_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_off00002fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FFF 22584 bytes
SHA-256: 746214de28b873320f4f097237ec2ae5995518a4bd855598616f25fff6fef165
font_01_sfnt_off00006298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6298 19648 bytes
SHA-256: c9b5e446bd4f49308c598e64be383601662d64f1913011d813836102a9eea03a

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