Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e81257e679fa0d…

MALICIOUS

PDF

37.2 KB Created: 2021-07-03 19:02:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b81c9178696210c7a8192e3de7f96ff1 SHA-1: db7e3ed9ab86fa0af23a397382317f251fa07c3e SHA-256: f6e81257e679fa0d73315c47f3086ef84a648f1087e50d6672aca38a42c17fca
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free in-game currency and hacks to entice users. It contains multiple embedded URLs, including one identified as a malicious redirector, which likely leads to further malicious content or malware downloads. The heuristic firings strongly indicate malicious redirector infrastructure and a lure for game hacks, supporting a social engineering attack pattern.

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-coin-master-spins-and-coins-for-daily-game-hack In PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coinmaster-free-spins-link_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-get-free-robux-without-logging-in_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-daily-free-coins-link_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/hack-a-game_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/wwwcoin-master-free-spincom_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-hack-mcpe-master-coins_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-games-free-sign-up_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-how-to-get-a-hacked-account-back_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/como-generar-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-get-free-robux-quick-and-easily_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/pokemon-go-free-roam_GM1094591345.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-do-i-get-robux-on-roblox_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
font_00_sfnt_off000037bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37BF 23560 bytes
SHA-256: 57d9b897e86ac59c43421d001c2492ac0605bf373bc8e37ff8b53ee68ab77b38
font_01_sfnt_off00006d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4C 18772 bytes
SHA-256: 365855f7de952552b9039cbc2e136aa4af0f445550e3e4c110e0b89cb5a86d06

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