Malicious PDF — malware analysis report

Static analysis result for SHA-256 40df34a58efe7f2d…

MALICIOUS

PDF

35.9 KB Created: 2021-07-04 08:51:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4e25048672394363d34218d98cd4f0f0 SHA-1: 07a4144dede89dd40d7d609b1851721bc4122979 SHA-256: 40df34a58efe7f2d8707dc200b1cc44feee0da8cffe0d7d8712146a3acf74682
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to redirectors and other PDF files, masquerading as game hacks and cheats. The primary lure is 'Coin Master Hack 2021' directing to http://netcdn.tw/app/406889139/coin-master-hack-2021-game-hack, which is flagged as a malicious redirector. The document body and embedded URLs suggest a social engineering tactic to trick users into downloading further malicious content.

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-hack-2021-game-hack In PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/tokyo-ghoul-project-killzone-roblox-cheat_GM431946152.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/cheat-roblox-diamond_GM431946152.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/by-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/coins-master-hacks_GM406889139.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/roblox-studio-2021-download-free_GM431946152.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/robux-code-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/free-account-giveaway-roblox_GM431946152.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn 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_off00003602.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3602 22788 bytes
SHA-256: 56557571d5795085c6a3451ed50485fb7d8c3f1ac1c91ca5ee06cb2c6ae66ca9
font_01_sfnt_off00006938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6938 18408 bytes
SHA-256: 8438728008f6ab05b5c9a65d4eeb1f2e5c23a436eadc11c6e76328f72b7d7fb7

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