Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82a24c81134fd7a…

MALICIOUS

PDF

35.8 KB Created: 2021-05-20 12:56:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 00ee95b75937990bf9d611b14897e7b3 SHA-1: 237195fbce930443b35e115ad84a01308e377415 SHA-256: a82a24c81134fd7a6b2cdbb3dd28fa6a3a6caee0b1b86b163e7fd7fc9af36a80
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/406889139/coin-master-spin-hack-game-hack PDF link annotation
    • http://mou16-murmansk.ru/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/coin-master-event-hack_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/free-robux-games-that-actually-work-2021_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_002_off000032a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32A1 24896 bytes
SHA-256: 70ad2fff0a453f2091faecff3558b6a4462956a31a65480bcffad3e22d1226f4
font_01_sfnt_off00006bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAB 17892 bytes
SHA-256: 7f3ff29013eb9f1a81458cbc85dd3db40ecf793c6bb68bdfdc199744a029032c

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