Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d84abc67b780e1…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 18:45:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: cd34d5b089832d034626a0c7ed9c75f0 SHA-1: 0ef72f223bf5a0e9f96a8d5ed88f3489d5794501 SHA-256: b9d84abc67b780e1ea5d6019d556e5ba8e3976dce63552fc2a98652cc4cb16f0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector domains, specifically advertising 'free generators' and 'game hacks' for popular games. These links are designed to lure users to potentially malicious websites. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is part of a phishing or scam campaign.

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 http://netcdn.tw/app/406889139/coin-master-free-spins-link-blogspot-2021-game-hack In PDF document text
    • http://oca.undil.tl/repository/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/113-hacked-client_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-rewards_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-place_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-roblox-followers-website-sitev3rmillionnet_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-codes-website_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-in-2021_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_002_off00002e40.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E40 22248 bytes
SHA-256: de3f2e12ed6b5f4e8887dd954e1a47233f314fba11f6afa612e49f24686aa1c6
font_01_sfnt_off00005f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F93 19036 bytes
SHA-256: f868d1b4b008750abeb491aae720fc8315e02cd8dd3bcefbbcb1193d1ab016b5

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