Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b2ba6c7f0931ae…

MALICIOUS

PDF

35.1 KB Created: 2021-05-25 10:02:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9dc7a238ca6c6cab70152bcf00a97ca7 SHA-1: b4aff24884f2cebc58d63860edcbe9c32b9af99e SHA-256: 18b2ba6c7f0931aec64904985e902205a883c767fe6cd102d1c4d7979a23ca60
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains embedded links that redirect to malicious infrastructure, specifically advertising a 'free generator' for a game. The heuristic firings indicate that the PDF is designed as a lure to trick users into clicking these links, likely to download further malware or lead them to a phishing site. No scripts were extracted, but the presence of malicious redirector links and the lure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

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/free-coin-master-spins-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_002_off00003074.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3074 24788 bytes
SHA-256: a700e0474888ce9d0b6f192d282f9a61468299e85fee500f6b63f879f881386c
font_01_sfnt_off00006967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6967 17884 bytes
SHA-256: dbba0adc3b1b7bb8b2e5e51fec5d28ab169e2f7a165ed2a14d616932af559aea

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