Malicious PDF — malware analysis report

Static analysis result for SHA-256 87faa5a3e32d85d7…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 20:06:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9b7b48dfee4f559481b2f817e148b391 SHA-1: dfd141e4180579d10958cd56bf779edbd0b531f3 SHA-256: 87faa5a3e32d85d729d4e617b01df4dda785375c5433be3415def1e86c42bc32
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free Robux' or 'game hacks'. The primary malicious URL identified is https://netcdn.online/app/431946152/free-robux-online-game-game-hack. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest an attempt to trick users into downloading further malware or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/431946152/free-robux-online-game-game-hack In PDF document text
    • http://www.flytec.com.py/download/files/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/roblox-op-free-gui_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-links-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/lots-of-robux_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/freer-pro-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/minecraft-windows-10-hack-client-2021_GM479516143.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/pubg-4-uccom_GM1330123889.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/50-000-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-minecraft-java-edition_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_off000052b9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52B9 26952 bytes
SHA-256: 8d0355e12506444c901cb300f2c285f2ffe2f250faaf17e27d0e3fcff2b92619
font_01_sfnt_off00008f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F22 18696 bytes
SHA-256: 502d3a6a89a344c633497032d058dbef498604fc41372c2f039b06ea9250cd00

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