Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb1a373cd518f8e…

MALICIOUS

PDF

42.0 KB Created: 2021-05-14 06:32:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7fb8a114efe603f2bfc185502060035a SHA-1: 349398712f46ad164b016bb68041e56cc5ac1b54 SHA-256: 3bb1a373cd518f8e479dc88d8ce6b2d0bbd117edacb80df7f61253f8c43c74fb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that lead to known malicious redirectors, specifically promoting 'game hacks' and 'free spins' for popular games. The document body and embedded artifacts suggest a lure to trick users into visiting these malicious sites, likely to download further malware or engage in phishing. The presence of multiple links to redirector infrastructure strongly indicates a malicious intent.

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/coin-master-free-spins-and-coins-blogspot-game-hack In PDF document text
    • http://educhina.mn/editor/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/easy-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-100-spin_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • http://educhina.mn/editor/files/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-robux-place_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-roblox-toys_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://educhina.mn/editor/files/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/get-free-spins-for-coin-master_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_off000048e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48E0 24788 bytes
SHA-256: 5ee96dd0bd9f810f3841f4a431fe4d322f1020e1a58f2a5763a9df00df9c6378
font_01_sfnt_off000080a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80A5 18636 bytes
SHA-256: 0f54115b9972647639797d248389657ce322f7c5c12f639c73d71ff235a73201

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