Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9668c3c0268d5a…

MALICIOUS

PDF

36.2 KB Created: 2021-07-04 15:00:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6b0ccb471065ab25aed42a35ee785e23 SHA-1: 50c4dfc6f9c3b6f85fe9d3e9264070a12727c04d SHA-256: df9668c3c0268d5a6f69a4ed24c6451b7b2581d6387684b522e3fc08e24786fa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure for free game currency and hacks, specifically mentioning 'Coin Master'. It contains multiple embedded URLs, with a critical finding being a link to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/coin-master-free-spin-and-coin-game-hack. This suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for further malware delivery or phishing.

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-spin-and-coin-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/online-coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-robux-pc_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-gold_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-stuff-on-roblox-catalog-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-gold-cards-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-fans-on-tiktok_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-tiktok-accounts_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/fbchampion-com_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-hack-software-free-download_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-112-hacked-client_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_002_off000035c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35C3 23472 bytes
SHA-256: 0686b6c12badf43b05a7680f8da135a6792ba7586cac4f7ef6a01ccce993ce58
font_01_sfnt_off00006af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF3 18348 bytes
SHA-256: 3aa320ccb9cb7c087074e4ef079b33192d8e05703f275142029ef104db56ac85

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