Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b0895595762bd9…

MALICIOUS

PDF

38.5 KB Created: 2021-05-10 11:39:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6cc5a4ea8f09a57c607cd3a8f1bec5f3 SHA-1: 9cffb9a8ed89a8c37032c526aca0b13ab53d1caf SHA-256: b3b0895595762bd9bfb7574e2ce9f125c0da40297925dcdb986cc03ea8001712
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 0.0128

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/coin-master-key-free-spin-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000340f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x340F 24596 bytes
SHA-256: 2bae3bbabf88c6f1474d8417570ec35562df1ab37ac8d872a2b3938061037673
font_01_sfnt_off00006bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDE 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00007590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7590 18068 bytes
SHA-256: a6c3c2eaeb9c71a1b96726afd9ac8ab3bac257b8360e25a1b58d00314c5a1876

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