Malicious PDF — malware analysis report

Static analysis result for SHA-256 4191c84d2ca814ef…

MALICIOUS

PDF

32.5 KB Created: 2021-06-07 11:50:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a35db529bc0323eee3a0c5c9fcb8eae9 SHA-1: 810dc94c3601a040a4ec2f76579d32870c538e4c SHA-256: 4191c84d2ca814ef570ba4a80721cdf286252e0d1bf5e103c8c5a0da95958ba8
92 Risk Score

Malware Insights

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

This PDF document was flagged as malicious. It uses an MFA/2FA-themed 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 0.0622

Heuristics 5

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.tw/app/431946152/roblox-how-to-hack-into-someones-account-2021-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
font_00_sfnt_off00002199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2199 25280 bytes
SHA-256: e1f964be4770c176264250f86b41df8d184d2f70e215f3159a452b86d15a22be
font_01_sfnt_off00005bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BAE 18824 bytes
SHA-256: 31c163f2b64a47347b9b035e6b4050a9f51f493fcc0ee4743d465b2ba85fe050

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