Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd8484e12186751…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 12:09:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dbeb2ee95f320162d554149206317f3b SHA-1: a10b5ff081ea8086ab91fb2578647efdb1ec98fc SHA-256: 5dd8484e12186751e5e63c5a8e4783861252fbb9f1231fef58e0b9690be9967e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games. The primary malicious URL identified is http://netcdn.tw/app/406889139/free-spin-coin-master-link-2021-game-hack, which is flagged as a malicious redirector. The document's content and embedded links strongly suggest a lure to download potentially unwanted or malicious software, masquerading as cheats or in-game currency generators.

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/free-spin-coin-master-link-2021-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/pubg-uc-unipin_GM1330123889.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/spinuri-gratis-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-unlimited-spins-game-download_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/get-free-clothing-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/lemonaid-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-hacks-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/f12-key-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/get-more-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/pokemon-go-free-gyarados_GM1094591345.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_off00002fc0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FC0 23160 bytes
SHA-256: 27c25c13993ab5176cd0a25eabacc86ab2068b604565a55a631377ebbee4b08a
font_01_sfnt_off000063d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D6 18748 bytes
SHA-256: 21e227a5b4a4e86201c5ffd53a68098e06ad4a81ecbeade678e9824eb4386a01

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