Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fd1089bd05076e…

MALICIOUS

PDF

44.7 KB Created: 2021-05-15 01:00:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f1c9aa4a1f461be74677a9bf8a1e107a SHA-1: c38f97fd35cd04205e46fcea3a2679c7fcab3cc4 SHA-256: 27fd1089bd05076e31361e06b8a72b93957d702cc598bcb32733a4fac8587c7a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, including one to a known malicious redirector infrastructure at `https://netcdn.xyz/app/431946152/roblox-free-robux-generator-game-hack`. The document's content and heuristics suggest a lure for game-related cheats or currency, designed to redirect users to potentially harmful sites. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/431946152/roblox-free-robux-generator-game-hack In PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-link-for-spins_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-free-spin-sites_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-mod-version-free-download_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-roblox-items-codes_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-robux-generator-com-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
stream_003_off00004b0e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B0E 29496 bytes
SHA-256: 1d6f64551f6455786a0abbf08ad6c415b4167877e0ff2b51ed1192b75b7eb1e2
font_01_sfnt_off00008bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BEA 18420 bytes
SHA-256: 9bedda8babb487e8554fc45ae48be92d4657fab6cfffaa18de719644ed37071c

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