Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72e5b80fbdaf7f6…

MALICIOUS

PDF

52.2 KB Created: 2021-06-03 07:48:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0474aeef87080ce6b3bbf5284c659dd6 SHA-1: 520071534fe8d86cfea1b92921436ee84143f5b6 SHA-256: f72e5b80fbdaf7f65ce1b788fb5765cbd6ebb90acd32e051552d1c2b5963ecec
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, specifically advertising a 'game hack' or 'free generator' lure. The primary malicious redirector identified is https://netcdn.online/app/406889139/regal-world-coin-master-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites, likely for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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.online/app/406889139/regal-world-coin-master-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/krnl-download_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/ac-market-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-followers-on-tiktok-no-human-verification_GM835599320.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-gift-cards_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/apocylopse-rising-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e36.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E36 25872 bytes
SHA-256: 43d747416bf5f1df151f0192c489e692dd846022073ca8b972d91381e8307945
font_01_sfnt_off00008ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC0 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off0000946e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x946E 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_03_sfnt_off0000a8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8F9 18280 bytes
SHA-256: 870151cc34d251c26f9607d3912ad3b2adf44136eb12da199d6464cd7fc312d3

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