Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca57115a7b30bd9c…

MALICIOUS

PDF

46.8 KB Created: 2021-05-11 18:37:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 18b53bd7fe340a62f6c2a7248070e673 SHA-1: 817caf29ca276cb1a60a733b45cdb24a78ef2097 SHA-256: ca57115a7b30bd9c4ddf1291a05200121d116af8e11318ac76addb8471ad47c0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'free generator / game hack' lures. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to these lures and embedded URLs, suggesting an attempt to trick users into visiting potentially harmful sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://netcdn.xyz/app/431946152/john-doe-roblox-hacker-game-hack In PDF document text
    • http://fkunismuh.org/perpustakaan/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/minecraft-cracked-client_GM479516143.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/roblox-online-free_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/hack-avatar_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-unlimited-spin-and-coin-hack_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-roblox-accounts-with-robux-that-work-2021_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_003_off00004ae4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AE4 31796 bytes
SHA-256: 01792cd77e36ddaffcc32f5a49e2699fa4f8a9e0e2f4afedc9954cd96b72ac48
font_01_sfnt_off000093f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93F2 18680 bytes
SHA-256: fd443decf8178cd51ee717e0f89bd27a56480e9e0f5488a79ceaa3e76e017fae

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