Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5689a8c85221410…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 22:52:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 74f7e1b23bac98d80a9f78da7e7780af SHA-1: 90a72a9dd95ddf7d779ae7a588e06f94cf8357dc SHA-256: a5689a8c85221410495818897e433eb06e46442f3bb1b110d20944d747b73076
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it's a lure for game-related cheats and generators, linking to known malicious redirectors and SEO link farms. The document body and embedded URLs reinforce this theme, aiming to trick users into visiting potentially harmful sites. While no scripts were directly extracted, the PDF structure and embedded links suggest a client-side exploitation or redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-codes-game-hack In PDF document text
    • http://pustaka1.unindra.id/repository/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/can-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/hackear-roblox-con-robux-con-fiddelr4_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/roblox-swordpack-t-shirt-free-shipping_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/how-to-become-an-admin-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-executors-for-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-robux-downlod_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/roblox-dragon-ball-mastered-script-hack_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/hack-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/deadmist-2-roblox-spawn-hack_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-hack-spin-160-pro_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/minecraft-book-collection_GM479516143.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/roblox-hackprogamers-com_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_off00003346.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3346 22844 bytes
SHA-256: 201278cf2d07f2ae2a5e9d804b4cc06108658096c46def69a9321290f4baa2c9
font_01_sfnt_off00006696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6696 18008 bytes
SHA-256: 9b1b8022fecd0e698345aa4518e5e5ceb9dfed4ff19bb9e19d156964a7983e20

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