Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e1c023e79fee084…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 07:52:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 04e00e75bb187aa940867c8db2d01807 SHA-1: 987b3ea12d32bb5d16a0c856d990fe46884f11b1 SHA-256: 0e1c023e79fee084e2604f55bc7b40239844251c4b26127a641df8e73e47a2c1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, using the promise of free game hacks and currency to redirect users to a network of websites. The document contains numerous links, many of which point to PDF files hosted on 'perpus.stmik-im.ac.id', forming a link farm. The primary lure URL is http://netcdn.tw/app/431946152/how-to-get-free-roblox-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/431946152/how-to-get-free-roblox-game-hack PDF link annotation
    • http://perpus.stmik-im.ac.id/repository/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-instantly-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-robux-hacks-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-high-school-life-free-stuff_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/hack-de-mad-city-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/easy-free-robux-website_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-player-exe-download-free_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-robux-items-with-this-admin-code_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-mods-in-minecraft_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/games-for-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-robux-hack-no-survey-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-roblox-giveaway-accounts_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/what-is-the-fastest-way-to-get-xp-in-pokemon-go_GM1094591345.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-robux-hack-2021-no-download-no-survey_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coins-master_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_off00003148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3148 22068 bytes
SHA-256: e58a13930c27184215c87d1393bfb83f5eed5b28bd9a41afa7dd5f7dab6d1c4e
font_01_sfnt_off00006209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6209 18920 bytes
SHA-256: 0cab8882f4c0675f5f492e8a84821542f7287f297f1ea8a50a76f0af58ce7d74

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