Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff315033ec83baa2…

MALICIOUS

PDF

42.7 KB Created: 2021-05-14 16:24:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 79efee239d48b9a08840316ccdc32492 SHA-1: 6ab40b4777eedec60bd97c31b828cd3a1c721ed0 SHA-256: ff315033ec83baa2fdadcbfc96a49ab361d8cf4a3656064bdefdef23b00df40c
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 0.9971

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 https://netcdn.xyz/app/479516143/free-mods-for-minecraft-pe-game-hack PDF link annotation
    • http://legs11.co.za/images/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://legs11.co.za/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/roblox-sexually_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/get-free-spins-on-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://legs11.co.za/images/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/coin-master-money-hack_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/free-spin-and-win-coin-master_GM406889139.pdfIn PDF document text
    • https://sigmaclient.info#2In PDF document text
    • https://flux.today#3In 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_off00004a3b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A3B 25888 bytes
SHA-256: c566cc7c8e80504b132665087ed1101591983043173c44bb89b7b6e23f42697f
font_01_sfnt_off00008590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8590 18040 bytes
SHA-256: 55677d50e7f19372d6dfb723d72c398dee248f925afb4425ab44c3bb4ecd28f4

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