Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f5f8aec8585120…

MALICIOUS

PDF

36.7 KB Created: 2021-06-29 19:44:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b21f21c31783ea299963f1db08e4cd9a SHA-1: e2228b30d209bfbad6b31bec26a5fcae9ac4a8b7 SHA-256: d3f5f8aec85851208e719f3c960888c501ebd3371c49c1601b3852d7ac3fc9c5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple embedded URLs that redirect to malicious infrastructure, specifically promoting game hacks and generators. The heuristic firings indicate that the document is designed as a lure, likely to trick users into visiting malicious sites or downloading further malware. No scripts were extracted, but the presence of malicious redirector links and the ML classifier's high confidence score strongly suggest a malicious intent.

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/hack-visea-roblox-game-hack In PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-dark-egg-on-raise-a-dragon-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/play-roblox-free-online_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/beyblad-rebirth-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-100-real-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-hacking-news_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-hack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/icarus-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-generator_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-tshhirt-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_off00003794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3794 22892 bytes
SHA-256: e19f62e0302f0246588a4bd2509afc82ffb8240513db1f9bacbcaeb8311beb20
font_01_sfnt_off00006afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFB 18912 bytes
SHA-256: 1ec2be0739fb262f5dddd30ae3ae54bc523b351d6c942f14086630a92e49f8f1

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