Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d921d3fd7e9d37…

MALICIOUS

PDF

34.5 KB Created: 2021-07-07 18:08:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ea5beef7bd0cb9858519138205a26e75 SHA-1: d186137958cf0b35aacecf79090b873d87212185 SHA-256: f3d921d3fd7e9d37166d4226149ea64a7d5034233b878af60af2bdf8dcdce1eb
160 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs that redirect to malicious infrastructure, specifically advertising game hacks and free currency generators. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-free-coins-facebook-game-hack, which is flagged as a known malicious redirector. The document's content and structure strongly suggest a phishing or scam attempt designed to lead users to potentially harmful websites.

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-coins-facebook-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/robux-miner_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/injet-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-do-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/blox-fun-info_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-coin-master-account_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/critical-strike-roblox-free-gamepass_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-hack-app-download-ios_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-free-medieval-hood-of-mystery_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-without-human-verification_GM406889139.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_off00002f3a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F3A 23508 bytes
SHA-256: 44eded3ac182f949ac701f61cf7a4dfe2659f9587221163091a6d826025a4083
font_01_sfnt_off00006416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6416 18324 bytes
SHA-256: a6ed948cf24eb29c37458194fefc1f47b33ce3c9afefa5bc0bcdf74f8f7d5de4

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