Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf804eac9d88585a…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 12:49:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 52cfe01591ae938bcca153c9feaca0bd SHA-1: 81c0dd8dfeae703c7127096d75405f10252ead2a SHA-256: cf804eac9d88585a1bd3fdc4caf4ae481f36a247593fa29104279c0b2e581fd4
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and generators, directing users to a known malicious redirector. The document body contains multiple URLs, including the primary malicious redirector and numerous links to other PDF files hosted on a content repository, suggesting a potential campaign distributing various lures. The presence of a password protection lure indicates an attempt to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/lastrick-com-coin-master-hack-game-hack In PDF document text
    • https://c2o-library.net/catalog/repository/guava-juice-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-instantly-get-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-coding-tshirt-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/jailbreak-beta-roblox-hack-dll_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/village-coin_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-coins_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/pokemon-go-for-free-download_GM1094591345.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/spare-reborn-roblox-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-jailbreak-speed-hack-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-people-hack-into-your-roblox-account_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/is-there-a-real-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/rbx-hut_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-t-shirt-free-download_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/get-free-robux-on-roblox-no-human-verification_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/generator-for-free-password-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/como-conseguir-diamantes-en-royale-high-roblox-hack_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_off00003230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3230 22756 bytes
SHA-256: 41172d1786329c0904d9ddb5d8d1be81c79ffaf996c24867408301330f7e2e17
font_01_sfnt_off00006522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6522 18264 bytes
SHA-256: 7487f1ced9a0ef44a39375eecee508f8bc18e69c364675b0881c5394564d02ce

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