Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4237fec0a92e64…

MALICIOUS

PDF

37.9 KB Created: 2021-05-20 18:27:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2b341d67535420ccb0b1cfb129ad4249 SHA-1: ec2af3345d03071b31d9b7e013408ecc7852a55b SHA-256: 1d4237fec0a92e64e584101819f971bf6cde1b81d319ee065691e769829f30ea
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 0.9407

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/431946152/free-robux-games-game-hack PDF link annotation
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/free-tiktok-followers-no-human-verification-or-survey_GM835599320.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/is-there-a-way-to-get-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_002_off000032da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32DA 27872 bytes
SHA-256: 232e5fd9d5e94358ec5eddbc0c33916868d2699a5368754a16f5d8ba50f11b5f
font_01_sfnt_off00007282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7282 18500 bytes
SHA-256: 50954281d46d1092d2c36c5fba9e04257001c8c7e5b0c8732206987489559ecb

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