Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1852bc173059f1…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 19:09:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0c3e7e546c3bbf9951df7657b522f10e SHA-1: 7af447a59683ca7a1f106d1d67b6717f5d7e46af SHA-256: cf1852bc173059f1c67edf835c42b07e30a41a3fbe26d4099d379bb8732b8d52
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, with a primary URL identified as a malicious redirector. The document body and heuristics indicate a lure related to game hacks and free spins, likely intended to lead users to malicious content or downloads. No scripts were extracted, but the presence of embedded URLs and the nature of the lure suggest a phishing or social engineering attack.

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/406889139/links-to-get-free-spins-on-coin-master-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-free-adiidas_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-your-friends-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-exploit-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/daily-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-why-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/master-game_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-vip-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/seven-v2-roblox-free-download-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-controversy_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-windows-10-key-free_GM479516143.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_off00002fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD5 22604 bytes
SHA-256: 4428f4f6d8e2e01254970033b2181f9b72a93a0cd336c05eef9a9179154b09cd
font_01_sfnt_off00006248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6248 18344 bytes
SHA-256: 1dde3a634a35d4e9c8cc8702715575f7350bc413b734fd9f7bac35511dc11ac3

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