Malicious PDF — malware analysis report

Static analysis result for SHA-256 6816915fed0db88c…

MALICIOUS

PDF

42.6 KB Created: 2021-05-20 00:36:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3ee09d16f6781e05c0b1503b2e9a667c SHA-1: 2a05e45384ad0ca59c82f7000fe082d5fe562572 SHA-256: 6816915fed0db88c905457217a15faadad606522bbc4e2273f96c2a8e2d2aba3
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/1330123889/pubg-uc-hack-2021-game-hack PDF link annotation
    • http://knjiznica-oroslavje.hr/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/robux-win_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-source_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-hack-reddit_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/tiktok-free-stuff_GM835599320.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/claimrbx-free-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
stream_003_off00004703.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4703 26356 bytes
SHA-256: 585016e0645d3bdde9833fb7c787545c4709ec22627c4f5011f56a4107075ab2
font_01_sfnt_off000082a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82A0 18696 bytes
SHA-256: 2492104ba64b376f023489f0419216055b36c971fba278bf68f5a14115d05efb

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