Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfae81b2db5f4367…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 05:47:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 743f5afe3b65062a5284e402c2cad097 SHA-1: ca3c6538408b93156c8c2bd872352fd437d66a69 SHA-256: cfae81b2db5f4367709e6aeaf98a0a2fc9df37bd86db1de011679b0098d70f51
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links designed to appear as "free generators" or "game hacks," redirecting users to malicious infrastructure. The document body and heuristics indicate a lure for game-related cheats, ultimately leading to a redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a potential for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/download-coin-master-apk-hack-game-hack In PDF document text
    • https://htdvn.com/public/upload/files/coin-master-free_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-free-rewards-link_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-level-3_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-com-games-referrer-roblox-player_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/minecraft-for-laptop-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
stream_004_off00005172.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5172 23716 bytes
SHA-256: d38cbfd2b507eef5aee1cf1622bed4e3c9b131b28b1be9def39eca236edaa06a
font_01_sfnt_off00008737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8737 18472 bytes
SHA-256: 889c97ae1e8c5f6287d7e9e9a77de81d4c7f2c24e7ca8efa3945bbdf42481e01

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