Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38b576320b89010…

MALICIOUS

PDF

36.9 KB Created: 2021-05-21 08:04:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3fd3a17b11b96dbfcfeb9f11f92be493 SHA-1: a3548e59f853fe747868fcb8af102f9a272d6e8d SHA-256: f38b576320b890109fb62a6eee86039e2fa4aa6fd0b692eed0be6cd5bb6fb25f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting a 'free generator' or 'game hack' lure. The ML classifier also flagged this PDF as malicious. The embedded links are designed to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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 https://netcdn.xyz/app/431946152/can-you-actually-get-free-robux-game-hack In PDF document text
    • http://deyuan-pc.com.tw/images/ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/body-roblox_GM431946152.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000330b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x330B 25256 bytes
SHA-256: 3558d6b2e6a165cd1a33535dff5041a16259a9dd0e05664d7f748b5fd46ce2e1
font_01_sfnt_off00006d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D97 18764 bytes
SHA-256: 47da03a4981b0a54a8018003304e59ec7e3f87382350c48cbaac3b3d81608ccf

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