Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b337f7df103a40…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 07:22:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 332cc5796023b4c9970eb890793c2a06 SHA-1: 6c0b4b8a233ad566933a58342da83e7850d461da SHA-256: 31b337f7df103a4095bd65ba0238fbd1e0fcbbef75125e2f76f66f5f926f5371
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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/roblox-online-free-no-download-game-hack PDF link annotation
    • https://pasca.unisba.ac.id/elibrary/repository/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/build-a-boat-for-treasure-roblox-hack_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/unlimited-robux-hack_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-to-get-free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-v3rmillion-hacks-youtube_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-free-gold-cards-link_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-to-hack-steal-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/real-robux-codes_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/download-synapse-x-roblox-free_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-to-get-game-pass-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-roblox-homestores_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-no-sign-up_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-mad-city-money-cheat_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-free-spins-link-2021-iphone_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-script-executor-free-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
font_00_sfnt_off00003013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3013 22200 bytes
SHA-256: 1bdf2a146398b87e32a6c4b4107acedc47253946b1d31ef31f821f69ab6a2b31
font_01_sfnt_off0000614f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x614F 19276 bytes
SHA-256: b38f8f12ef08a1ab95ae278c1cbb6a6ad2930ce96fc7aecc851d669e5ab47f9e

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