Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a9f786d69839ad…

MALICIOUS

PDF

42.9 KB Created: 2021-05-14 17:34:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f28f751c13781c740718c41869054a2f SHA-1: 59878f8f9a82884703e49ab79c127cd052246b5a SHA-256: 41a9f786d69839ad337b8818ef4ce8f160c96c391da7b26e42acbcdaeca3ffb7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for free game currency and spins, directing users to a malicious redirector URL. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/free-spins-coin-master-daily-game-hack In PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-freebies-2021_GM406889139.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/free-robux-picture_GM431946152.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/free-download-coin-master_GM406889139.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-free-spins-16-04-19_GM406889139.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/free-spins-coin-master-apple_GM406889139.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/hacks-and-cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/get-robux-com_GM431946152.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-hack-using-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/roblox-cheat-robux_GM431946152.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/coinmaster-fan-page_GM406889139.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-generator-hack_GM406889139.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_off00004be4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BE4 24908 bytes
SHA-256: 358fcc2e81299f790bf5b9e2d8fa1498c520bf6ba32950e600d7156265b00b9b
font_01_sfnt_off00008572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8572 18308 bytes
SHA-256: 148513adc370bd80d4aa437ff839b9fedc0d32c70a1f1942828a2071191e315e

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