Malicious PDF — malware analysis report

Static analysis result for SHA-256 619946d15681a31e…

MALICIOUS

PDF

30.8 KB Created: 2021-07-18 23:18:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 319642a0da2d23a1e2f0326cd306d1c8 SHA-1: 0f88904e8db5dcf020857ef92f7cd1e7dda51dec SHA-256: 619946d15681a31ee46046da54f243937f864ac92419c2f898c39704ce0457a4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically advertising a 'free generator / game hack' for Minecraft. The ML classifier also flagged this PDF as malicious. The embedded links are designed to trick users into downloading further malware or visiting compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8483

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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 http://netcdn.tw/app/479516143/minecraft-java-edition-code-free-game-hack In PDF document text
    • http://www.bripi.pl/images/freer-pro-tiktok_GM835599320.pdfIn PDF document text
    • http://www.bripi.pl/images/minecraft-bedrock-free-with-java_GM479516143.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
font_00_sfnt_off0000251c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x251C 22660 bytes
SHA-256: 61d2e0f62f4ec53459d4c8004da965c605b57db94be4114d60f830a7ef4e5f2d
font_01_sfnt_off00005712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5712 18164 bytes
SHA-256: f60a0ad92d00317e2c15f806bb6b4e732b7ddb4bf4afc6afb4b51f1f749874bc

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