Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8313c7cc8793982…

MALICIOUS

PDF

35.0 KB Created: 2021-05-16 13:25:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 139d8421dfb342ced333e158f99add93 SHA-1: 36ae400891e2c5473ff8596292fc13748130c68c SHA-256: d8313c7cc87939829244e023abace9d2433352f39d657fc2cb4e01c9a292f7d3
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically advertising a "Master Coin Free Link" and a "CLICK HERE TO ACCESS COIN MASTER GENERATOR" lure. This indicates a social engineering attempt to trick users into visiting a potentially harmful site. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a malicious redirector workflow.

Machine Learning

  • Nyx PDF Classifier clean score 0.0306

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/406889139/master-coin-free-link-game-hack In 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_003_off00003252.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3252 23840 bytes
SHA-256: a32b5ddc48e1b0ba50834c698c379ee1ae23276628d070c2a50189ac90b42703
font_01_sfnt_off00006883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6883 17880 bytes
SHA-256: f325bc51a5f33ec2ea6c889aa635c0e4104002a1859551a05fb0fcec2a10294b

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