Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1ee3622e09217d…

MALICIOUS

PDF

44.0 KB Created: 2021-05-19 06:04:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 022e0d2134b48e5da94c0f5a3132f24a SHA-1: 8badd10be8230bc4f0ca83a6a2817e0d0a1dd709 SHA-256: 8e1ee3622e09217d5900b14801c0e6427f94eb42493656b17790d24bda44387e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, using the guise of game hacks and free spins to trick users into clicking malicious links. It contains a primary link to a known malicious redirector and a large number of SEO-optimized PDF links hosted on yeushuen.com.tw, likely serving as a link farm to distribute further malicious content or engage in SEO poisoning. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-daily-spins-coin-master-game-hack In PDF document text
    • https://yeushuen.com.tw/image/data/files/minecraft-items_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-2021_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-roblox-toy-codes-2021_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/flip-master-coins-hack_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/daily-coin-master-free-spin-link-facebook_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/minecraft-pvp-hacks_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_003_off00004cdc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CDC 26212 bytes
SHA-256: 1caaf8504f5413d2f83824d0746fb5537d3734468bcc187d7a5ae72227767b39
font_01_sfnt_off000089b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89B7 18308 bytes
SHA-256: 55eaac4e6bbee5e06de7435d22c867d27a3c8151a397b13177f5239675c95764

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