Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff6bbd43c07d8af…

MALICIOUS

PDF

41.6 KB Created: 2021-06-13 22:51:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c632befd829acfa7646c9a2e3777e9bc SHA-1: 6bbc3866d0c85e07da8c506998fc2d4344d12f40 SHA-256: 4ff6bbd43c07d8afef5ba818f8d79f6fe0c5ec4352415e3e3daf2782457cb5b4
280 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and SEO spam pages, masquerading as game hacks and free currency generators. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the presence of numerous links to suspicious domains strongly indicate a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains URLs that align with the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.co/app/431946152/vex0rmillion-hack-roblox-game-hack In PDF document text
    • http://library.atim.ac.id/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/como-tener-mas-seguidores-en-roblox-sin-hacks_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-free-robux-test-site_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-free-level-6-and-level-7-injectors_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-into-bloxburg-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/robux-hack-no-human-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-gamepass-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-install-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-adidas-shirt-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/fee-roblox-hacks_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
stream_003_off000047a2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47A2 24060 bytes
SHA-256: c6809bd8d6dcf71313843748d7c23f495025f2b1a6df0ad18371bb4030456a89
font_01_sfnt_off00007e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E61 18868 bytes
SHA-256: 149adf8ccbb91c8646e94baa74d03559c53c375aa94b1027c317303567deba4f

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