Malicious PDF — malware analysis report

Static analysis result for SHA-256 84eac78fec1f3ef0…

MALICIOUS

PDF

34.6 KB Created: 2021-06-28 13:36:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: bcee266cf2f20c444b12ee6a7792688b SHA-1: c6a72efb1e0e63897d431e8d5c180aaeb1ea40af SHA-256: 84eac78fec1f3ef0cfc648ec9a5129d504ec6f2ecf7cd3dd032c5423593225a7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a primary link pointing to a 'free generator / game hack' lure. This heuristic, combined with the ML classifier, strongly suggests a phishing or scam attempt. The document body contains the primary malicious URL, indicating the user is intended to interact with it.

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.co/app/431946152/how-to-donate-robux-for-free-game-hack In PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/youtube-roblox-avatar-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/hacks-for-mad-city-roblox-immortality_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-clothing-templates-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/robux-generator_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/make-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/roblox-hack-download-android-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-new_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-tiktok-fans-app_GM835599320.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/mobi-hack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/roblox-cbro-how-to-get-free-knife_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-free-shirts-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-daily-rewards-link_GM406889139.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_off00003062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3062 22288 bytes
SHA-256: 023247b7b9434831319d4116e1bce8e0cd38f380c9a01459c9574a3d3b95c88f
font_01_sfnt_off000061e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E7 19152 bytes
SHA-256: 654c73808fe5e5b8fa24faaa9ef8e70913653ce868b8b18a51f3b09e5649a94e

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