Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4dbadb4c1673f1…

MALICIOUS

PDF

42.8 KB Created: 2021-05-20 01:42:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3ad5cc5aad901a1c7eeb65d3de896745 SHA-1: 37fea6914501a6191eb88dad803bec1975d1ce81 SHA-256: cb4dbadb4c1673f1bdf202396e68af64c05b055773f8c8e25b19aacc6b24c031
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, disguised as 'free generator' or 'game hack' lures. The primary malicious URL identified is https://netcdn.xyz/app/835599320/tiktok-free-textbooks-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a redirection workflow designed to lead users to potentially harmful content or further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/835599320/tiktok-free-textbooks-game-hack In PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-card-collection-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/robux-download_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-co_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/pokemon-go-free-gps-hack_GM1094591345.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/freerobux-hack-us_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/spin-coin_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-a_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/tiktok-free-pro-app-download_GM835599320.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-hack-spin-160-pro_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_003_off00004773.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4773 27432 bytes
SHA-256: ac85642dc5ffd0825e67f5525005630fa0c21ee225eae7ad18fed06acb2cba2a
font_01_sfnt_off00008621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8621 17824 bytes
SHA-256: 04243df8154ed71930de1a6b48a6a414358eab1d588844450dcb70ab7756c918

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