Malicious PDF — malware analysis report

Static analysis result for SHA-256 a809c3256a2c7ef0…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 02:41:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3e90e412d907cbfba2a79a0925e8ce5a SHA-1: c039df50c8cf2003df1d3d53cb6b651c188a85df SHA-256: a809c3256a2c7ef0976d86fe5103a071f9cf25a18d0384d295f843cd199d2c9c
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/406889139/coin-master-15-free-spin-link-of-last-5-days-game-hack PDF link annotation
    • https://vireco.store/ckfinder/userfiles/files/coin-master-free-spin-best-link_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/unlimited-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/coin-master-fb-free-spins-link_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/xbox-one-roblox-free_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/how-to-get-free-tiktok-fans-without-human-verification_GM835599320.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/how-to-get-the-best-shirts-on-roblox-free_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/how-to-sell-stuff-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/free-robux-without-verification-new_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/free-hats-roblox-2021-unpatched-urban420-network_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/20210-robux_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_off00002fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEC 22548 bytes
SHA-256: 6d9fbd3209b6ccc925d8bfe8a74a9a039e7164ac1d4f3a73492d4dcf80154874
font_01_sfnt_off00006260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6260 18932 bytes
SHA-256: ab5bf67824d9f1de49592764067eca3c5a6c622e8f4c11d8ed5e999977e69fe8

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