Malicious PDF — malware analysis report

Static analysis result for SHA-256 b540d3b7ce403f12…

MALICIOUS

PDF

36.1 KB Created: 2021-05-21 00:42:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 076747639e7083820dc4a203cd49b40e SHA-1: af383a0275d1ba97b2c8ec027ef15212f85f96b6 SHA-256: b540d3b7ce403f124a2c8ef656e70876f57dd81bfe43158a350ccda52ca59e1f
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 0.9492

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/minecraft-hacks-xbox-game-hack PDF link annotation
    • http://www.tdbaska.hr/files/hack-coin-master-net_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/coin-master-hacksco_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
stream_002_off000031f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F4 25588 bytes
SHA-256: b9244f0aeb43cdb51a08c17194d3a31a654f374822ef6e06f8b730a0a17069c9
font_01_sfnt_off00006b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B40 18476 bytes
SHA-256: 08d143bbdffcf64d63a65049f265cbb68e766144a512c2d0a1cb0386676e8729

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