Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a4cb17dc6f6d41…

MALICIOUS

PDF

37.1 KB Created: 2021-05-23 16:21:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dd480b868b0e83d6ab2bcd17a859fe06 SHA-1: 9f783277319900fdd65904b0cdfe3dbafd7c62bb SHA-256: b1a4cb17dc6f6d415ca210d2b2ce98f33873c4475b25713579dbda04a7b37d0c
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 0.9447

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-free-daily-spins-link-game-hack PDF link annotation
    • http://dana1157.com/images/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • http://dana1157.com/images/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://dana1157.com/images/free-robux-android_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/free-roblox-adopt-me-accounts_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/free-robux-without-human-verification_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_off000035af.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35AF 24828 bytes
SHA-256: e4a4f7d8facda334748aeb788345349eedde3df5aeb98f4f29480f5763c8a0df
font_01_sfnt_off00006ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF7 18476 bytes
SHA-256: 219409e4a96e727ac7d03afbf10b928993c8ec078f24206d8d8724722cb954a1

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