Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf440114d50d9dc…

MALICIOUS

PDF

36.1 KB Created: 2021-05-22 08:46:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 126f6cb390b2ebcf988d7f7505196575 SHA-1: 8827503f6c4b4ade20db75837a4c59498fb6fa79 SHA-256: bbf440114d50d9dcb4950cc4dc84c491ff562dd47229a5d814daa9cb87d95046
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/835599320/free-tiktok-app-game-hack PDF link annotation
    • https://gimnaziya6.kz/images/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • https://gimnaziya6.kz/images/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://gimnaziya6.kz/images/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://gimnaziya6.kz/images/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://gimnaziya6.kz/images/minecraft-pocket-edition-apk-free-download_GM479516143.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_off00003047.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3047 26496 bytes
SHA-256: 5d62f53409e3e675c4b7f18e25d2f006deb11fd14a9f2825cba54b24babb6f58
font_01_sfnt_off00006dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAE 17632 bytes
SHA-256: ea608747ff9a73a218f7ff90867c843845867270d7f940ccd5b7614aaec9a371

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