Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efc9ffc06053f7a…

MALICIOUS

PDF

35.7 KB Created: 2021-05-10 13:20:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 55b5e6611006f752975e2a1f4289cd4f SHA-1: 60d71d0fdc4eca05483978331c03f89cdf205a6d SHA-256: 4efc9ffc06053f7a54a753c95d65e6d937bd25581084c2ddef04f61ae121d367
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious. It uses a seed-phrase/secret-recovery lure. 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 clean score 0.0282

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/hack-coin-master-ios-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003441.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3441 24192 bytes
SHA-256: 0278820d9140f8520e6878e8fb7e138c6bd8996afdfdc72ed0dc57125171e77e
font_01_sfnt_off00006bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD0 17716 bytes
SHA-256: 4e3a035fcc4d7e34a70bc1936180ad88d62d1a278a85b436915b1920e97724ff

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